diff --git a/mods/CORE/mcl_damage/API.md b/mods/CORE/mcl_damage/API.md
index 1b2a3895b6..76b74ee9fa 100644
--- a/mods/CORE/mcl_damage/API.md
+++ b/mods/CORE/mcl_damage/API.md
@@ -10,3 +10,7 @@ Register damage modifier.
 * priority: int, define call order of registered functions
   
     You should make use higher values for important or most used functions.
+
+## mcl_damage.from_mt(mt_reason)
+Convert mt damage reason (nil, fall, drown, punch, node_damage) to mc like reason.
+* mt_reason: table, mt damage reason
\ No newline at end of file