diff --git a/sc2/doc/devel/glossary b/sc2/doc/devel/glossary
index a6f4a67c8..2ecbba5de 100644
--- a/sc2/doc/devel/glossary
+++ b/sc2/doc/devel/glossary
@@ -1,6 +1,6 @@
 Abbreviations used in the code:
 
 IP                 interplanetary
-NPC                non-player character 
-SIS                ??? (it refers to the flagship)
+NPC                non-player character
+SIS                Super-Integrated-Starship (the flagship)