diff --git a/l10n/en-US/viewer.properties b/l10n/en-US/viewer.properties
index 3c4e43b45..f25d4e280 100644
--- a/l10n/en-US/viewer.properties
+++ b/l10n/en-US/viewer.properties
@@ -268,6 +268,7 @@ editor_ink_canvas_aria_label=User-created image
 # LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
 # when people can't see the image.
 editor_alt_text_button_label=Alt text
+editor_alt_text_edit_button_label=Edit alt text
 editor_alt_text_dialog_label=Choose an option
 editor_alt_text_dialog_description=Alt text (alternative text) helps when people can’t see the image or when it doesn’t load.
 editor_alt_text_add_description_label=Add a description
diff --git a/src/display/editor/editor.js b/src/display/editor/editor.js
index 959d33ed4..c8b54e015 100644
--- a/src/display/editor/editor.js
+++ b/src/display/editor/editor.js
@@ -150,6 +150,7 @@ class AnnotationEditor {
     AnnotationEditor._l10nPromise ||= new Map(
       [
         "editor_alt_text_button_label",
+        "editor_alt_text_edit_button_label",
         "editor_alt_text_decorative_tooltip",
       ].map(str => [str, l10n.get(str)])
     );
@@ -831,6 +832,7 @@ class AnnotationEditor {
       .get("editor_alt_text_button_label")
       .then(msg => {
         altText.textContent = msg;
+        altText.setAttribute("aria-label", msg);
       });
     altText.tabIndex = "0";
     altText.addEventListener(
@@ -865,6 +867,12 @@ class AnnotationEditor {
     if (!button || (!this.#altTextDecorative && !this.#altText)) {
       return;
     }
+    AnnotationEditor._l10nPromise
+      .get("editor_alt_text_edit_button_label")
+      .then(msg => {
+        button.setAttribute("aria-label", msg);
+      });
+
     let tooltip = this.#altTextTooltip;
     if (!tooltip) {
       this.#altTextTooltip = tooltip = document.createElement("span");
diff --git a/web/l10n_utils.js b/web/l10n_utils.js
index d83e94ff3..097a02221 100644
--- a/web/l10n_utils.js
+++ b/web/l10n_utils.js
@@ -83,6 +83,7 @@ const DEFAULT_L10N_STRINGS = {
   editor_ink2_aria_label: "Draw Editor",
   editor_ink_canvas_aria_label: "User-created image",
   editor_alt_text_button_label: "Alt text",
+  editor_alt_text_edit_button_label: "Edit alt text",
   editor_alt_text_decorative_tooltip: "Marked as decorative",
 };
 if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) {