diff --git a/CHANGELOG.md b/CHANGELOG.md
index bed1df5502..f8b8afc7e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -54,6 +54,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - [#7469](https://github.com/apache/trafficcontrol/pull/7469) *Traffic Ops* Changed logic to not report empty or missing cookies into TO error.log.
 
 ### Fixed
+- [#6340](https://github.com/apache/trafficcontrol/issues/6340) *Traffic Ops* Fixed alert messages for POST and PUT invalidation job APIs.
 - [#7511](https://github.com/apache/trafficcontrol/pull/7511) *Traffic Ops* Fixed the changelog registration message to include the username instead of duplicate email entry.
 - [#7465](https://github.com/apache/trafficcontrol/issues/7465) *Traffic Ops* Fixes server_capabilities v5 apis to respond with RFC3339 date/time Format
 - [#7441](https://github.com/apache/trafficcontrol/pull/7441) *Traffic Ops* Fixed the invalidation jobs endpoint to respect CDN locks.
diff --git a/traffic_ops/traffic_ops_golang/invalidationjobs/invalidationjobs.go b/traffic_ops/traffic_ops_golang/invalidationjobs/invalidationjobs.go
index 22f9d887b5..41a0f5a5aa 100644
--- a/traffic_ops/traffic_ops_golang/invalidationjobs/invalidationjobs.go
+++ b/traffic_ops/traffic_ops_golang/invalidationjobs/invalidationjobs.go
@@ -958,7 +958,7 @@ func UpdateV40(w http.ResponseWriter, r *http.Request) {
 
 	if job.InvalidationType != input.InvalidationType {
 		if input.InvalidationType == tc.REFETCH && !refetchAllowed(inf.Tx.Tx) {
-			userErr = errors.New("Invalidation Type REFRESH is disallowed")
+			userErr = errors.New("Invalidation Type REFETCH is disallowed")
 			errCode = http.StatusBadRequest
 			api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, nil)
 			return
@@ -1455,7 +1455,7 @@ func validateJobCreateV4(job tc.InvalidationJobCreateV4, tx *sql.Tx) error {
 	}
 
 	if job.InvalidationType == tc.REFETCH && !refetchAllowed(tx) {
-		errs = append(errs, "InvalidationType is invalid")
+		errs = append(errs, "invalidationType is not allowed since 'refetch_enabled' parameter doesn't exists or the value is not set to a case-insensitive 'true'")
 	}
 
 	if len(errs) > 0 {