diff --git a/.changeset/26170-translation-data-comment-count.md b/.changeset/26170-translation-data-comment-count.md
new file mode 100644
index 00000000000..ddcb991774e
--- /dev/null
+++ b/.changeset/26170-translation-data-comment-count.md
@@ -0,0 +1,10 @@
+---
+'@objectstack/spec': patch
+---
+
+docs(spec): the `TranslationDataSchema` TSDoc counts sixteen per-app translation groups, not fifteen
+
+Clause-②: no
+Metadata-protocol: none
+
+The comment on `TranslationDataSchema` said "Fifteen groups" after the `hooks` and `books` groups both landed; the per-app bundle (`appTranslationDataShape()`) has sixteen. Comment only: no schema, describe, refusal message or generated artifact changes.
diff --git a/packages/spec/src/system/translation.zod.ts b/packages/spec/src/system/translation.zod.ts
index fcf67510b71..26b209a5ccf 100644
--- a/packages/spec/src/system/translation.zod.ts
+++ b/packages/spec/src/system/translation.zod.ts
@@ -2079,7 +2079,7 @@ const platformSettingsShape = () => ({
  * One locale of a PER-APP translation bundle — `stack.translations`, and
  * everything {@link defineTranslationBundle} builds.
  *
- * Fifteen groups: every group the platform bundle declares EXCEPT `settings`,
+ * Sixteen groups: every group the platform bundle declares EXCEPT `settings`,
  * which is platform-only and is refused here by name with
  * {@link PER_APP_SETTINGS_PLATFORM_ONLY} as the remedy. See
  * {@link PlatformTranslationDataSchema} for the seventeen-group face and for why