fix README

README.md

@@ -26,6 +26,16 @@ permissions:
 
 You can find more information about the required permissions under the corresponding options that you wish to use.
 
+## Statefulness
+
+If the action ends because of [operations-per-run](#operations-per-run) then the next run will start from the first
+unprocessed issue skipping the issues proceeded during the previous run(s). The state is reset when all the issues are
+proceeded. This should be considered for scheduling workflow runs.
+
+The saved state lifetime is the same as the
+[actions cache](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#usage-limits-and-eviction-policy)
+configured for the repo.
+
 ## All options
 
 ### List of input options