diff --git a/docs/Lua API.rst b/docs/Lua API.rst
index 059f28d37..fc750f077 100644
--- a/docs/Lua API.rst	
+++ b/docs/Lua API.rst	
@@ -1397,11 +1397,11 @@ Units module
 
 * ``dfhack.units.isNightCreature(unit)``
 
-  The unit is undead, but not a vampire.
+  The unit is a Night Creature.
 
 * ``dfhack.units.isSemiMegabeast(unit)``
 
-  The unit is undead, but not a vampire.
+  The unit is a semi-megabeast.
 
 * ``dfhack.units.isMegabeast(unit)``