1 files changed, 1 insertions, 1 deletions

diff --git a/src/mailman/rules/no_subject.py b/src/mailman/rules/no_subject.py
index e6a3be6ed..ed020b81e 100644
--- a/src/mailman/rules/no_subject.py
+++ b/src/mailman/rules/no_subject.py
@@ -34,7 +34,7 @@ class NoSubject:
 
     def check(self, mlist, msg, msgdata):
         """See `IRule`."""
-        # Convert the header value to string because it may be an
+        # Convert the header value to a str because it may be an
         # email.header.Header instance.
         subject = str(msg.get('subject', '')).strip()
         return subject == ''