diff --git a/lua/cmp/types/cmp.lua b/lua/cmp/types/cmp.lua
index 36a9c49..8759aca 100644
--- a/lua/cmp/types/cmp.lua
+++ b/lua/cmp/types/cmp.lua
@@ -62,6 +62,7 @@ cmp.ItemField = {
 ---@field public buffer fun(c: cmp.ConfigSchema)
 ---@field public global fun(c: cmp.ConfigSchema)
 ---@field public cmdline fun(type: string, c: cmp.ConfigSchema)
+---@field public filetype fun(type: string|string[], c: cmp.ConfigSchema)
 
 ---@class cmp.SourceApiParams: cmp.SourceConfig