diff --git a/lms/djangoapps/certificates/models.py b/lms/djangoapps/certificates/models.py
index c757d209b5..66e9009ce6 100644
--- a/lms/djangoapps/certificates/models.py
+++ b/lms/djangoapps/certificates/models.py
@@ -514,8 +514,9 @@ class CertificateInvalidation(TimeStampedModel):
     notes = models.TextField(default=None, null=True)
     active = models.BooleanField(default=True)
 
-    # This is necessary because CMS does not install the certificates app, but it
-    # imports this models code. Simple History will attempt to connect to the installed
+    # This is necessary because CMS does not install the certificates app, but
+    # this code is run when other models in this file are imported there (or in
+    # common code). Simple History will attempt to connect to the installed
     # model in the certificates app, which will fail.
     if 'certificates' in apps.app_configs:
         history = HistoricalRecords()