diff --git a/src/frontend/app/adv-search/adv-search.component.html b/src/frontend/app/adv-search/adv-search.component.html
index edf92a0fa1e10ced2da945920f4fb24c3073df9b..2ec7d87c733a947c42892f8c6e263b6395046eeb 100644
--- a/src/frontend/app/adv-search/adv-search.component.html
+++ b/src/frontend/app/adv-search/adv-search.component.html
@@ -48,7 +48,7 @@
                                     [title]="indexingFieldService.getField(critKey.key).label"></i>&nbsp;{{appCriteriaTool.getFormatLabel(critKey.value.values)}}&nbsp;<i class="fa fa-times-circle"></i></span>
                         </ng-container>
                         <ng-container *ngIf="!isArrayType(critKey.value.values) && critKey.key === 'meta'">
-                            <span class="label badge-search" [title]="'meta'" (click)="removeCriteria(critKey.key)">"{{critKey.value.values}}"&nbsp;<i class="fa fa-times-circle"></i></span>
+                            <span class="label badge-search" [title]="'meta'" (click)="removeCriteria(critKey.key)">{{critKey.value.values}}&nbsp;<i class="fa fa-times-circle"></i></span>
                         </ng-container>
                     </ng-container>
                 </div>
diff --git a/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.html b/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.html
index 43251ba221773dd3ee53cb9848c5b09a9eb96a71..10a5c8fac1e7d1d53fd6619fc4f32f3d61450fcb 100755
--- a/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.html
+++ b/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.html
@@ -79,12 +79,13 @@
                 </mat-autocomplete>
             </mat-form-field>
         </div>-->
-                <div style="display: grid;align-items: start;grid-template-columns: repeat(2, 1fr);max-height: 300px;overflow: hidden;overflow-y: auto;">
+                <div
+                    style="display: grid;align-items: start;grid-template-columns: repeat(2, 1fr);max-height: 300px;overflow: hidden;overflow-y: auto;">
                     <div style="display: grid;align-items: baseline;grid-template-columns: 35% 60% 5%;"
                         *ngFor="let field of currentCriteria;let i=index">
                         <ng-container *ngIf="field.type === 'string'">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <mat-form-field class="input-form" floatLabel="never">
                                 <input [id]="field.identifier" type="text" matInput
@@ -93,7 +94,7 @@
                         </ng-container>
                         <ng-container *ngIf="field.type === 'integer'">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <mat-form-field class="input-form" floatLabel="never">
                                 <input [id]="field.identifier" type="number" matInput [formControl]="field.control"
@@ -102,7 +103,7 @@
                         </ng-container>
                         <ng-container *ngIf="['select', 'radio', 'checkbox'].indexOf(field.type) > -1">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <plugin-select-search [id]="field.identifier" [showResetOption]="true" [label]="field.label"
                                 [placeholderLabel]="'lang.chooseValue' | translate" [formControlSelect]="field.control"
@@ -111,7 +112,7 @@
                         </ng-container>
                         <ng-container *ngIf="['selectAutocomplete'].indexOf(field.type) > -1">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <plugin-select-autocomplete-search #pluginSelectAutocompleteSearch [id]="field.identifier"
                                 [showResetOption]="true" [label]="field.label"
@@ -122,14 +123,16 @@
                         </ng-container>
                         <ng-container *ngIf="field.type === 'date'">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <mat-form-field class="input-form input-date" floatLabel="never" (click)="picker.open()"
                                 style="cursor:pointer;">
                                 <mat-date-range-input [rangePicker]="picker">
-                                    <input matStartDate [placeholder]="'lang.start' | translate" [value]="field.control.value.start"
+                                    <input matStartDate [placeholder]="'lang.start' | translate"
+                                        [value]="field.control.value.start"
                                         (dateChange)="field.control.value.start=$event.value">
-                                    <input matEndDate [placeholder]="'lang.end' | translate" [value]="field.control.value.end"
+                                    <input matEndDate [placeholder]="'lang.end' | translate"
+                                        [value]="field.control.value.end"
                                         (dateChange)="field.control.value.end=$event.value">
                                 </mat-date-range-input>
                                 <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
@@ -138,7 +141,7 @@
                         </ng-container>
                         <ng-container *ngIf="['senders','recipients'].indexOf(field.identifier) > -1">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <app-contact-autocomplete [id]="field.identifier" [control]="field.control"
                                 style="width:100%;">
@@ -146,35 +149,35 @@
                         </ng-container>
                         <ng-container *ngIf="field.identifier === 'folders'">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <app-folder-input [control]="field.control" style="width:100%;">
                             </app-folder-input>
                         </ng-container>
                         <ng-container *ngIf="field.identifier === 'tags'">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <app-tag-input [control]="field.control" style="width:100%;">
                             </app-tag-input>
                         </ng-container>
                         <ng-container *ngIf="field.type === 'banAutocomplete'">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <app-address-ban-input [control]="field.control" style="width:100%;">
                             </app-address-ban-input>
                         </ng-container>
                         <ng-container *ngIf="field.identifier === 'registeredMail_issuingSite'">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <app-issuing-site-input #appIssuingSiteInput [control]="field.control" style="width:100%;">
                             </app-issuing-site-input>
                         </ng-container>
                         <ng-container *ngIf="field.identifier === 'registeredMail_recipient'">
                             <span class="criteria-label">
-                                <i class="fa {{field.icon}}"></i> {{field.label}}&nbsp;:&nbsp;
+                                <i class="fa {{field.icon}}"></i> {{field.label}} <sup class="searchInAttachments" *ngIf="searchInAttachments(field.identifier)" [title]="'lang.searchInAttachmentsInfo' | translate">(1)</sup>&nbsp;:&nbsp;
                             </span>
                             <app-registered-mail-recipient-input #appRegisteredMailRecipientInput
                                 [control]="field.control" style="width:100%;">
@@ -190,6 +193,10 @@
                     style="color: white;font-size: 12px;font-style: inherit;padding: 10px;opacity: 0.5;padding-top: 25px;">
                     Les critères de recherche se cumulent sur la recherche rapide
                 </div>
+                <div
+                    style="color: white;font-size: 12px;font-style: inherit;padding: 10px;opacity: 0.5;">
+                    <sup>(1)</sup> {{'lang.searchInAttachmentsInfo' | translate}}
+                </div>
             </ng-container>
             <ng-template #loadingTemplate>
                 <mat-spinner class="loader"></mat-spinner>
diff --git a/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.scss b/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.scss
index bb01ad85187e02a2e6a2ea3b3171d13c128d4ce3..764dfcc75a05413741c6fcae4532787029ae170a 100644
--- a/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.scss
+++ b/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.scss
@@ -116,4 +116,16 @@
     align-items: center;
     color: #135f7f;
     font-weight: bold;
+}
+
+.fieldDesc {
+    font-size: 10px;
+    text-align: right;
+    color: white;
+    font-style: italic;
+    opacity: 0.5;
+}
+
+.searchInAttachments {
+    cursor: help;
 }
\ No newline at end of file
diff --git a/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.ts b/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.ts
index 7babc64a8603613a54071be978c72dbe8cfd76ce..e9371bd6a150637e0a402b48797d1bc4bc4c1359 100644
--- a/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.ts
+++ b/src/frontend/app/adv-search/criteria-tool/criteria-tool.component.ts
@@ -247,6 +247,10 @@ export class CriteriaToolComponent implements OnInit {
         this.getCurrentCriteriaValues();
     }
 
+    searchInAttachments(identifier: string) {
+        return ['subject', 'chrono'].indexOf(identifier) > -1;
+    }
+
     set_meta_field(value: any) {
         this.searchTermControl.setValue(value);
     }
diff --git a/src/frontend/service/indexing-fields.service.ts b/src/frontend/service/indexing-fields.service.ts
index 0d9a2bb97158763634ae99821aeaf10b9c4766bc..e9efaac88866aee1b0e358ea5c0b17983bf7ec9d 100644
--- a/src/frontend/service/indexing-fields.service.ts
+++ b/src/frontend/service/indexing-fields.service.ts
@@ -29,7 +29,7 @@ export class IndexingFieldsService {
         {
             identifier: 'subject',
             label: this.translate.instant('lang.subject'),
-            icon: 'fa-question',
+            icon: 'fa-quote-left',
             unit: 'mail',
             type: 'string',
             system: true,
@@ -50,6 +50,24 @@ export class IndexingFieldsService {
             values: [],
             enabled: true,
         },
+        {
+            identifier: 'chrono',
+            label: this.translate.instant('lang.chrono'),
+            icon: 'fa-compass',
+            type: 'string',
+            default_value: [],
+            values: [],
+            enabled: true,
+        },
+        {
+            identifier: 'creationDate',
+            label: this.translate.instant('lang.creationDate'),
+            icon: 'fa-calendar-day',
+            type: 'date',
+            default_value: [],
+            values: [],
+            enabled: true,
+        },
         {
             identifier: 'recipients',
             label: this.translate.instant('lang.getRecipients'),
diff --git a/src/lang/lang-fr.json b/src/lang/lang-fr.json
index bd56d616736b25fba7d91be6cf7216365406322a..2809fbec18c7f1dcb4213e941a82182d06ec848d 100644
--- a/src/lang/lang-fr.json
+++ b/src/lang/lang-fr.json
@@ -2038,5 +2038,6 @@
     "start": "Début",
     "end": "Fin",
     "createSearchTemplate": "Enregistrer un modèle...",
-    "infoImportregisteredMails" : "Les fichiers <b>sans en-tête</b> sont mappés en fonction des <b>positions des colonnes</b> du fichier.<br/>Les valeurs <b>par défaut</b> définis dans le <b>modèle d'enregistrement</b> utilisé sont prises en compte."
+    "infoImportregisteredMails" : "Les fichiers <b>sans en-tête</b> sont organisés en fonction des <b>positions des colonnes</b> du fichier.<br/>Les valeurs <b>par défaut</b> définis dans le <b>modèle d'enregistrement</b> utilisé sont prises en compte.",
+    "searchInAttachmentsInfo" : "Indique que la recherche se fait sur les courriers et les pièces jointes."
 }