diff --git a/mem.md b/mem.md
index 80e6a88..1079ca5 100644
--- a/mem.md
+++ b/mem.md
@@ -13,7 +13,7 @@ Variable | Meaning | Type | Default
 `timeout` | Refresh timeout seconds | int | 3
 `settings` | User settings | function | empty function
 
-`settings` can use the strings `used` (memory used MB) and `swapused` (swap used MB).
+`settings` can use the strings `mem_now.used` (memory used MB) and `mem_now.swapused` (swap used MB).
 
 ### output