diff --git a/README.md b/README.md
index 28d11920..1e2e7dc4 100644
--- a/README.md
+++ b/README.md
@@ -64,3 +64,7 @@ jobs:
         stale-pr-label: 'no-pr-activity'
         exempt-pr-labels: 'awaiting-approval,work-in-progress'
 ```
+
+### Debugging
+
+To see debug ouput from this action, you must set the secret `ACTIONS_STEP_DEBUG` to `true` in your repository. You can run this action in debug only mode (no actions will be taken on your issues) by passing `debug-only` `true` as an argument to the action.
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