diff --git a/api.txt b/api.txt
index 0bd0234..83af0cb 100644
--- a/api.txt
+++ b/api.txt
@@ -410,6 +410,7 @@ mob_class:day_docile() -- return True if mob docile during current daytime
 mob_class:mob_expire(pos, dtime) -- check if mob is to despawn
 mob_class:get_nodes() -- get specific nodes around mob
 mob_class:on_blast(damage) -- function called when mob in blast area
+mob_class:is_inside(itemtable) -- returns True is mob collisionbox inside any node/group in table
 
 
 Adding Mobs in World