diff --git a/apps/red-ui/src/app/modules/dossier/screens/file-preview-screen/file-preview-screen.component.ts b/apps/red-ui/src/app/modules/dossier/screens/file-preview-screen/file-preview-screen.component.ts
index 12a92c76c..9341ce02f 100644
--- a/apps/red-ui/src/app/modules/dossier/screens/file-preview-screen/file-preview-screen.component.ts
+++ b/apps/red-ui/src/app/modules/dossier/screens/file-preview-screen/file-preview-screen.component.ts
@@ -116,7 +116,7 @@ export class FilePreviewScreenComponent implements OnInit, OnDestroy, OnAttach,
     get assignTooltip(): string {
         return this.appStateService.activeFile.isUnderApproval
             ? 'dossier-overview.assign-approver'
-            : 'dossier-overview.assign-reviewer';
+            : this.assignOrChangeReviewerTooltip;
     }
 
     get annotations(): AnnotationWrapper[] {
@@ -514,6 +514,12 @@ export class FilePreviewScreenComponent implements OnInit, OnDestroy, OnAttach,
         return false;
     }
 
+    get assignOrChangeReviewerTooltip() {
+        return this.currentReviewer
+            ? 'file-preview.change-reviewer'
+            : 'file-preview.assign-reviewer';
+    }
+
     get currentReviewer(): string {
         return this.appStateService.activeFile.currentReviewer;
     }
diff --git a/apps/red-ui/src/assets/i18n/en.json b/apps/red-ui/src/assets/i18n/en.json
index 40512a628..9533de10d 100644
--- a/apps/red-ui/src/assets/i18n/en.json
+++ b/apps/red-ui/src/assets/i18n/en.json
@@ -387,6 +387,7 @@
     "reviewer": "Assigned to",
     "unassigned": "Unassigned",
     "assign-reviewer": "Assign Reviewer",
+    "change-reviewer": "Change Reviewer",
     "assign-me": "Assign to me",
     "last-reviewer": "Last Reviewed by:",
     "fullscreen": "Full Screen (F)",