diff --git a/l10n/en-US/viewer.ftl b/l10n/en-US/viewer.ftl
index 6c431c3b5..226ac71dc 100644
--- a/l10n/en-US/viewer.ftl
+++ b/l10n/en-US/viewer.ftl
@@ -684,15 +684,16 @@ pdfjs-editor-delete-comment-popup-button =
 
 # An existing comment is edited
 pdfjs-editor-edit-comment-dialog-title-when-editing = Edit comment
+pdfjs-editor-edit-comment-dialog-save-button-when-editing = Update
 
 # No existing comment
 pdfjs-editor-edit-comment-dialog-title-when-adding = Add comment
+pdfjs-editor-edit-comment-dialog-save-button-when-adding = Add
 
 pdfjs-editor-edit-comment-dialog-text-input =
     .placeholder = Start typing…
 
 pdfjs-editor-edit-comment-dialog-cancel-button = Cancel
-pdfjs-editor-edit-comment-dialog-save-button = Save
 
 ## Edit a comment button in the editor toolbar
 
diff --git a/web/comment_manager.js b/web/comment_manager.js
index 1f164b5b3..d0e4e57b4 100644
--- a/web/comment_manager.js
+++ b/web/comment_manager.js
@@ -681,12 +681,25 @@ class CommentDialog {
     this.#commentText = str || "";
     const textInput = this.#textInput;
     textInput.value = this.#previousText = this.#commentText;
-    this.#title.setAttribute(
-      "data-l10n-id",
-      str
-        ? "pdfjs-editor-edit-comment-dialog-title-when-editing"
-        : "pdfjs-editor-edit-comment-dialog-title-when-adding"
-    );
+    if (str) {
+      this.#title.setAttribute(
+        "data-l10n-id",
+        "pdfjs-editor-edit-comment-dialog-title-when-editing"
+      );
+      this.#saveButton.setAttribute(
+        "data-l10n-id",
+        "pdfjs-editor-edit-comment-dialog-save-button-when-editing"
+      );
+    } else {
+      this.#title.setAttribute(
+        "data-l10n-id",
+        "pdfjs-editor-edit-comment-dialog-title-when-adding"
+      );
+      this.#saveButton.setAttribute(
+        "data-l10n-id",
+        "pdfjs-editor-edit-comment-dialog-save-button-when-adding"
+      );
+    }
     if (options?.height) {
       textInput.style.height = `${options.height}px`;
     }
diff --git a/web/viewer.html b/web/viewer.html
index a22e0b863..3d53b8b13 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -803,7 +803,7 @@ See https://github.com/adobe-type-tools/cmap-resources
               <span data-l10n-id="pdfjs-editor-edit-comment-dialog-cancel-button"></span>
             </button>
             <button id="commentManagerSaveButton" type="button" class="primaryButton" disabled tabindex="0">
-              <span data-l10n-id="pdfjs-editor-edit-comment-dialog-save-button"></span>
+              <span data-l10n-id="pdfjs-editor-edit-comment-dialog-save-button-when-adding"></span>
             </button>
           </div>
         </div>