diff --git a/core/mem/mem.odin b/core/mem/mem.odin
index 96ec1990a..8ce48d489 100644
--- a/core/mem/mem.odin
+++ b/core/mem/mem.odin
@@ -332,7 +332,7 @@ and returns an integer count of the `T` between them.
 - `b`: A pointer to a type T
 
 **Returns**
-- `b` - `a` in items of T as an `int`.
+- `a` - `b` in items of T as an `int`.
 
 Example:
 
@@ -704,4 +704,4 @@ calc_padding_with_header :: proc "contextless" (ptr: uintptr, align: uintptr, he
 		}
 	}
 	return int(padding)
-}
\ No newline at end of file
+}