diff --git a/verify.py b/verify.py
index 14d90eb..a990987 100755
--- a/verify.py
+++ b/verify.py
@@ -30,6 +30,7 @@ def collect_user_dirs():
 def last_commit_for(dir: Path, ref: git.Reference):
     """Returns the Git commit signature for the last commit on this path."""
     last_commit_hash = str(ref.repo.git.rev_list("--max-count=1", action_ref, dir))
+    log.debug(last_commit_hash)
     return ref.repo.commit(last_commit_hash)