diff --git a/src/frontend/app/attachments/attachments-list.component.html b/src/frontend/app/attachments/attachments-list.component.html
index 3ff2c3f2aab9e79ad27fe401f2c3fc59380ae9fa..cebd0242b7ad585d25198f95d753170e28766a9a 100644
--- a/src/frontend/app/attachments/attachments-list.component.html
+++ b/src/frontend/app/attachments/attachments-list.component.html
@@ -62,7 +62,7 @@
                     <div class="col-md-6">
                         <mat-form-field>
                             <input matInput title="{{attachment.firstname_typist}} {{attachment.lastname_typist}}"
-                                [value]="attachment.firstname_typist+' '+attachment.lastname_typist"
+                                [value]="attachment.lastname_typist != null ? attachment.firstname_typist+' '+attachment.lastname_typist : lang.undefined"
                                 placeholder="{{lang.by}}" disabled>
                         </mat-form-field>
                     </div>
diff --git a/src/frontend/app/header/header-right.component.html b/src/frontend/app/header/header-right.component.html
index 3f80cc1f2c9af050cd42b6ff118869066efd17cc..d4d0533162ac1b5e252e89b299d962618056ea5a 100644
--- a/src/frontend/app/header/header-right.component.html
+++ b/src/frontend/app/header/header-right.component.html
@@ -13,11 +13,10 @@
         <input #searchHome type="submit" name="submit" value="" style="display:none">
     </form>
 
-    <button (click)="showSearchInput()" mat-icon-button *ngIf="!mobileMode && hideSearch" style="opacity:0.5;">
+    <button title="{{lang.quickSearchInfo + ' : '+ lang.quickSearchTarget}}" (click)="showSearchInput()" mat-icon-button *ngIf="!mobileMode && hideSearch" style="opacity:0.5;">
         <mat-icon class="fa fa-search" style="font-size:22px;"></mat-icon>
     </button>
 
-
     <button mat-icon-button [matMenuTriggerFor]="applications" *ngIf="!mobileMode" matTooltip="{{lang.menu}}">
         <mat-icon class="fa fa-th" style="font-size:22px;"></mat-icon>
     </button>
diff --git a/src/frontend/app/search/search-home.component.html b/src/frontend/app/search/search-home.component.html
index 6042d43568d920603d7a3b3f6af47e539a8ad02a..f7609b7cbeb9077bb13fd5225974afa0bd98e06f 100755
--- a/src/frontend/app/search/search-home.component.html
+++ b/src/frontend/app/search/search-home.component.html
@@ -4,7 +4,7 @@
     <input type="hidden" name="baskets_clause" value="true">
     <mat-form-field id="searchInput" floatLabel="never" style="width:100%">
         <input matInput type="text" name="welcome" placeholder="{{lang.searchMails}}" style="width:100%">
-        <button mat-button matSuffix mat-icon-button type="submit" aria-label="Clear" style="opacity:0.5;">
+        <button title="{{lang.quickSearchInfo + ' : '+ lang.quickSearchTarget}}" mat-button matSuffix mat-icon-button type="submit" aria-label="Clear" style="opacity:0.5;">
           <mat-icon class="fa fa-search"></mat-icon>
         </button>
     </mat-form-field>
diff --git a/src/frontend/lang/lang-en.ts b/src/frontend/lang/lang-en.ts
index 5cfd380c8e5b8941d3ab0edbffe1b93a3ea0fd3f..15caba318f5996bb2668572bc0cdea1cd0781403 100755
--- a/src/frontend/lang/lang-en.ts
+++ b/src/frontend/lang/lang-en.ts
@@ -937,4 +937,6 @@ export const LANG_EN = {
     "addPerson"                                 : "Add a person",
     "actionDone"                                : "Action done",
     "actionMassForbidden"                       : "This action is forbidden in mass",
+    "quickSearchInfo"                           : "Target search ",
+    "quickSearchTarget"                         : "subject (mail / attachment), chrono number (courrier / attachment), reference mail, notes content, barcode, attachment contact (society / lastanme / firstname)",
 };
diff --git a/src/frontend/lang/lang-fr.ts b/src/frontend/lang/lang-fr.ts
index 7a5ae067a2909ed5ac5cb89d62c3d943c74347e4..875bd032cf41cace550b662101da3d9b6efac8cb 100755
--- a/src/frontend/lang/lang-fr.ts
+++ b/src/frontend/lang/lang-fr.ts
@@ -964,4 +964,6 @@ export const LANG_FR = {
     "addPerson"                                         : "Ajouter une personne",
     "actionDone"                                        : "Action effectuée",
     "actionMassForbidden"                               : "Cette action n\'est pas utilisable en masse",
+    "quickSearchInfo"                                   : "Cible de la recherche",
+    "quickSearchTarget"                                 : "sujet (courrier / pièce jointe), numéro chrono (courrier / pièce jointe), référence courrier expéditeur, contenu d\'annotations, code à barre, contact pièce jointe (société / nom / prénom)",
 };
diff --git a/src/frontend/lang/lang-nl.ts b/src/frontend/lang/lang-nl.ts
index 15633abd60e2bf68464c2cdc158d83503d369366..e8980da8689747cde5b6d717a68e97bcaef6e8d5 100755
--- a/src/frontend/lang/lang-nl.ts
+++ b/src/frontend/lang/lang-nl.ts
@@ -965,4 +965,6 @@ export const LANG_NL = {
     "addPerson"                                 : "Add a person", //_TO_TRANSLATE
     "actionDone"                                : "Action effectuée", //_TO_TRANSLATE
     "actionMassForbidden"                       : "This action is forbidden in mass", //_TO_TRANSLATE
+    "quickSearchInfo"                           : "Target search ", //_TO_TRANSLATE
+    "quickSearchTarget"                         : "subject (mail / attachment), chrono number (courrier / attachment), reference mail, notes content, barcode, attachment contact (society / lastanme / firstname)", //_TO_TRANSLATE
 };