diff --git a/buildman/jobutil/buildjob.py b/buildman/jobutil/buildjob.py
index e507dab5f..e53b9bcb2 100644
--- a/buildman/jobutil/buildjob.py
+++ b/buildman/jobutil/buildjob.py
@@ -1,9 +1,12 @@
 import json
+import logging
 
 from cachetools import lru_cache
 from endpoints.notificationhelper import spawn_notification
 from data import model
 
+logger = logging.getLogger(__name__)
+
 
 class BuildJobLoadException(Exception):
   """ Exception raised if a build job could not be instantiated for some reason. """
@@ -74,6 +77,8 @@ class BuildJob(object):
     if not cached_tag:
       cached_tag = self._determine_cached_tag_by_tag()
 
+    logger.debug('Determined cached tag %s for %s: %s', cached_tag, base_image_id, cache_comments)
+
     return cached_tag
 
   def _determine_cached_tag_by_comments(self, base_image_id, cache_commands):