diff --git a/src/core/CCString.mli b/src/core/CCString.mli
index 29e470ec..e1eabf66 100644
--- a/src/core/CCString.mli
+++ b/src/core/CCString.mli
@@ -442,7 +442,7 @@ val edit_distance : string -> string -> int
     the formula [distance a b + distance b c >= distance a c]. *)
 
 (** {2 Slices}
-    
+
     A contiguous part of a string *)
 
 module Sub : sig