Fix Readme

README.md

@@ -190,6 +190,17 @@ integrations:
       ...
 ```  
 
+### Plan Diff mode
+
+The action provides a `plan-diff` mode that compares the newly generated plan against the previously stored plan and fails the workflow if any differences are detected.
+
+To enable plan diff mode, set the `plan-diff` input to `true`.
+
+> [!IMPORTANT]
+> When plan-diff is disabled, the action will apply the stored plan without re-validating it.
+> This may result in unintended changes if the underlying infrastructure has been modified between the plan and apply steps.
+> Additionally, stored plans are single-use: even if an apply operation fails for any reason, the plan becomes outdated and cannot be reused.
+
 ### Workflow example
 
 In this example, the action is triggered when certain events occur, such as a manual workflow dispatch or the opening, synchronization, or reopening of a pull request, specifically on the main branch. It specifies specific permissions related to assuming roles in AWS. Within the "apply" job, the "component" and "stack" are hardcoded (`foobar` and `plat-ue2-sandbox`). In practice, these are usually derived from another action. 

README.yaml

@@ -189,9 +189,9 @@ usage: |-
   To enable plan diff mode, set the `plan-diff` input to `true`.
 
   > [!IMPORTANT]
-> When plan-diff is disabled, the action will apply the stored plan without re-validating it.
-> This may result in unintended changes if the underlying infrastructure has been modified between the plan and apply steps.
-> Additionally, stored plans are single-use: even if an apply operation fails for any reason, the plan becomes outdated and cannot be reused.
+  > When plan-diff is disabled, the action will apply the stored plan without re-validating it.
+  > This may result in unintended changes if the underlying infrastructure has been modified between the plan and apply steps.
+  > Additionally, stored plans are single-use: even if an apply operation fails for any reason, the plan becomes outdated and cannot be reused.
 
   ### Workflow example