diff --git a/tools/releasetools/blockimgdiff.py b/tools/releasetools/blockimgdiff.py
index 8b6a690..d33c2f7 100644
--- a/tools/releasetools/blockimgdiff.py
+++ b/tools/releasetools/blockimgdiff.py
@@ -521,7 +521,7 @@
         stashed_blocks -= free_size
 
       if common.OPTIONS.cache_size is not None:
-        # Sanity check: abort if we're going to need more stash space than
+        # Validation check: abort if we're going to need more stash space than
         # the allowed size (cache_size * threshold). There are two purposes
         # of having a threshold here. a) Part of the cache may have been
         # occupied by some recovery logs. b) It will buy us some time to deal