diff --git a/README.md b/README.md
index 4525f05..ee4faee 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,9 @@ they configure.
 | `review-channel` | `diffpal` | `--review-channel` |
 | `out` | empty | `--out` |
 
+The exact `feedback` behavior is owned by the installed DiffPal CLI version.
+Pin `diffpal-version` when you want rollout-safe, reproducible review behavior.
+
 ### Review Tuning
 
 | Input | Default | CLI flag |
diff --git a/action.yml b/action.yml
index 9bba4e2..ccdea77 100644
--- a/action.yml
+++ b/action.yml
@@ -44,7 +44,7 @@ inputs:
     required: false
     default: ""
   feedback:
-    description: Review feedback shape. Use summary, balanced, or inline.
+    description: Review feedback shape passed to diffpal review github. Pin diffpal-version for reproducible behavior across CLI releases.
     required: false
     default: balanced
   summary-overview: