diff --git a/S99-glossary.pod b/S99-glossary.pod
index 7e80fa010..de9368265 100644
--- a/S99-glossary.pod
+++ b/S99-glossary.pod
@@ -626,6 +626,10 @@ Longest Token Matching. See L<S05/Longest Token Matching>.
 
 =head2 method
 
+=head2 MI
+
+Multiple inheritance
+
 =head2 mischan
 
 A case of having put a message on the wrong (IRC) channel.