diff --git a/comictaggerlib/taggerwindow.py b/comictaggerlib/taggerwindow.py
index 0ea91d5..df250dc 100644
--- a/comictaggerlib/taggerwindow.py
+++ b/comictaggerlib/taggerwindow.py
@@ -1363,6 +1363,7 @@ Please choose options below, and select OK.
         self.cbMaturityRating.addItem("PG", "")
         self.cbMaturityRating.addItem("Kids to Adults", "")
         self.cbMaturityRating.addItem("Teen", "")
+        self.cbMaturityRating.addItem("M", "")
         self.cbMaturityRating.addItem("MA15+", "")
         self.cbMaturityRating.addItem("Mature 17+", "")
         self.cbMaturityRating.addItem("R18+", "")