1 files changed, 2 insertions, 1 deletions
diff --git a/api.txt b/api.txt
index f6b8d48..72f023c 100644
--- a/api.txt
+++ b/api.txt
@@ -126,7 +126,8 @@ functions needed for the mob to work properly which contains the following:
    'pathfinding'         set to 1 for mobs to use pathfinder feature to locate
                          player, set to 2 so they can build/break also (only
                          works with dogfight attack and when 'mobs_griefing'
-                         in minetest.conf is not false).
+                         in minetest.conf is not false). Adding {unbreakable=1}
+                         to node groups stops them being broken by mobs.
    'immune_to'           is a table that holds specific damage when being hit by
                          certain items e.g.
       {"default:sword_wood",  0} -- causes no damage.