diff --git a/content/applications/app_specific/building_wrf.md b/content/applications/app_specific/building_wrf.md
index f29e7926cace7e1787a67ab73bd5c998daed8214..e53847b1dd3e33ec761d98c0954cc58d0c362111 100644
--- a/content/applications/app_specific/building_wrf.md
+++ b/content/applications/app_specific/building_wrf.md
@@ -706,7 +706,7 @@ no error messages should be present and several programs will exist in the `util
 
 #### Apply patch
 
-In order to build WPS 3.x successfully , the configure source file requires patching.  For convenience,
+In order to build WPS 4.x successfully , the configure source file requires patching.  For convenience,
 these are contained in a single patch file which can be applied.  Note that _applying the patch
 should only be done **once** after unpacking the source code._  Subsequent builds (even after
 running `clean -a`) do **not** require rerunning the patch command.  Starting in the top level of