diff --git a/api.txt b/api.txt
index 3053cc1..f81f9da 100644
--- a/api.txt
+++ b/api.txt
@@ -80,6 +80,7 @@ This functions registers a new mob as a Minetest entity.
             'explode' follows player in range and will flash and explode when in reach
             'dogshoot' shoots arrows when in range and one on one attack when in reach
         'custom_attack' is a function that is called when mob is in range to attack player, parameters are (self, to_attack)
+        'on_blast' is called when TNT explodes near mob, function uses (object, damage) and returns (do_damage, do_knockback, drops)
         'explosion_radius' radius of explosion attack (defaults to 1)
         'arrow' if the attack_type is "shoot" or "dogshoot" then the entity name of the arrow is required
         'shoot_interval' the minimum shoot interval