diff --git a/dictsource/ar_rules b/dictsource/ar_rules
index a7524353..f53eb507 100644
--- a/dictsource/ar_rules
+++ b/dictsource/ar_rules
@@ -346,6 +346,7 @@
           ُ           u   // damma
           ُو          uu
           َا          aa
+          ًا (_S2     an
           َى          aa
           ٰ           aa  // superscript alef
           ِ           i   // kasra