diff --git a/sys/dev/md/md.c b/sys/dev/md/md.c
index 1f7cb086e85..6334e043d0e 100644
--- a/sys/dev/md/md.c
+++ b/sys/dev/md/md.c
@@ -13,7 +13,7 @@
  */
 
 /*-
- * The following functions are based in the vn(4) driver: mdstart_swap(),
+ * The following functions are based on the vn(4) driver: mdstart_swap(),
  * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(),
  * and as such under the following copyright:
  *