diff --git a/src/core/opamHash.mli b/src/core/opamHash.mli
index 65d21df748a..7674661b78e 100644
--- a/src/core/opamHash.mli
+++ b/src/core/opamHash.mli
@@ -28,7 +28,7 @@ include OpamStd.ABSTRACT with type t := t
 
 val of_string_opt: string -> t option
 
-(** Check is [hash] contains only 0 *)
+(** Check if [hash] contains only 0 *)
 val is_null: t -> bool
 
 (** returns a sub-path specific to this hash, e.g.