diff --git a/add_generic_dialogs.lua b/add_generic_dialogs.lua
index 83dc3fe..9cd639c 100644
--- a/add_generic_dialogs.lua
+++ b/add_generic_dialogs.lua
@@ -207,7 +207,7 @@ yl_speak_up.check_and_add_as_generic_dialog = function(dialog, n_id)
 						  and r.r_type ~= "take_item"
 						  and r.r_type ~= "move"
 						  and r.r_type ~= "function"
-						  and r.r_type ~= "custom"
+						  and r.r_type ~= "evaluate"
 						  and r.r_type ~= "dialog"
 						) then
 							return "Effect "..tostring(r_id)..
diff --git a/exec_apply_effects.lua b/exec_apply_effects.lua
index 44f6f12..5634567 100644
--- a/exec_apply_effects.lua
+++ b/exec_apply_effects.lua
@@ -794,10 +794,6 @@ yl_speak_up.execute_effect = function(player, n_id, o_id, r)
 			minetest.colorize(yl_speak_up.chat_all_color, text))
 		-- sending a chat message always counts as successful
 		return true
-	-- "Call custom functions that are supposed to be overridden by the server.", -- 13
-	elseif(r.r_type == "custom") then
-		-- execute the custom function
-		return yl_speak_up.effect_custom(player, r.r_value)
 	end
 	-- fallback: unkown type
 	return false
diff --git a/fs_edit_effects.lua b/fs_edit_effects.lua
index 7476613..bebb2b3 100644
--- a/fs_edit_effects.lua
+++ b/fs_edit_effects.lua
@@ -66,9 +66,6 @@
 -- execute lua code ("function"): requires npc_master priv
 -- 	r_value		the lua code that shall be executed
 --
--- call a custom function ("custom"):
--- 	r_value		parameter that is passed on to the custom function
---
 -- Unlike in preconditions, trade (the trade action already happened) and
 -- inventory actions are not supported as effects.
 --
@@ -94,7 +91,6 @@ local check_what = {
 	"take item from player and destroy it (requires npc_master priv)", -- 10
 	"move the player to a given position (requires npc_master priv)", -- 11
 	"execute Lua code (requires npc_master priv)", -- 12
-	"Call custom functions that are supposed to be overridden by the server.", -- 13
 }
 
 -- how to store these as r_type in the precondition:
@@ -108,8 +104,7 @@ local values_what = {"", "state",
 	"craft", "on_failure", "chat_all",
 	-- the following require the npc_master priv:
 	"give_item", "take_item", "move", "function",
-	-- custom function (does not require npc_master priv)
-	"custom"}
+	}
 
 -- unlike in the preconditions, the "I cannot punch it" option is
 -- not offered here - because the player (and later the NPC) needs
@@ -282,8 +277,6 @@ yl_speak_up.show_effect = function(r, pname)
 		return "If the *previous* effect failed, go to dialog \""..tostring(r.r_value).. "\"."
 	elseif(r.r_type == "chat_all") then
 		return "Send chat message: \""..tostring(r.r_value).."\""
-	elseif(r.r_type == "custom") then
-		return "Call custom function with param: \""..tostring(r.r_value).."\"."
 	elseif(r.r_type == "put_into_block_inv") then
 		if(not(r.r_pos) or type(r.r_pos) ~= "table"
 		  or not(r.r_pos.x) or not(r.r_pos.y) or not(r.r_pos.z)) then