diff --git a/cockatrice/src/carddatabase.h b/cockatrice/src/carddatabase.h
index 28d56d13..09edeff4 100644
--- a/cockatrice/src/carddatabase.h
+++ b/cockatrice/src/carddatabase.h
@@ -20,7 +20,7 @@ class QNetworkRequest;
 
 typedef QMap<QString, QString> QStringMap;
 
-// If we don't typedef this, CardInfo::CardInfo will refuse to compile on OS X.
+// If we don't typedef this, CardInfo::CardInfo will refuse to compile on OS X < 10.9
 typedef QMap<QString, int> MuidMap;
 
 class CardSet : public QList<CardInfo *> {