diff --git a/lua/blink/cmp/config/keymap.lua b/lua/blink/cmp/config/keymap.lua
index 0f4bfe8e..0c09b4a2 100644
--- a/lua/blink/cmp/config/keymap.lua
+++ b/lua/blink/cmp/config/keymap.lua
@@ -24,7 +24,7 @@
 --- | 'scroll_signature_down' Scroll the signature window down
 --- | 'snippet_forward' Move the cursor forward to the next snippet placeholder
 --- | 'snippet_backward' Move the cursor backward to the previous snippet placeholder
---- | (fun(cmp: blink.cmp.API): boolean?) Custom function where returning true will prevent the next command from running
+--- | (fun(cmp: blink.cmp.API): string? | boolean?) Custom function where returning true will prevent the next command from running. Returning a string will insert the literal characters
 
 --- @alias blink.cmp.KeymapPreset
 --- | 'none' No keymaps
diff --git a/lua/blink/cmp/keymap/apply.lua b/lua/blink/cmp/keymap/apply.lua
index 9fa32f99..156ef70f 100644
--- a/lua/blink/cmp/keymap/apply.lua
+++ b/lua/blink/cmp/keymap/apply.lua
@@ -23,7 +23,9 @@ function apply.keymap_to_current_buffer(keys_to_commands)
 
           -- run user defined functions
         elseif type(command) == 'function' then
-          if command(require('blink.cmp')) then return end
+          local ret = command(require('blink.cmp'))
+          if type(ret) == 'string' then return ret end
+          if ret then return end
 
           -- otherwise, run the built-in command
         elseif require('blink.cmp')[command]() then