diff --git a/api.txt b/api.txt
index f26227e..e00c9d9 100644
--- a/api.txt
+++ b/api.txt
@@ -90,6 +90,7 @@ functions needed for the mob to work properly which contains the following:
                    level is between the min and max values below
    'light_damage_min' minimum light value when mob is affected (default: 14)
    'light_damage_max' maximum light value when mob is affected (default: 15)
+                      When both set to 15, only kill mob with natural light.
    'suffocation'   when > 0 mobs will suffocate inside solid blocks and will be
                    hurt by the value given every second (0 to disable).
    'floats'        when set to 1 mob will float in water, 0 has them sink.