diff --git a/modules/repofiles/temp_repo.go b/modules/repofiles/temp_repo.go
index 0d867736432..a02bba65e9c 100644
--- a/modules/repofiles/temp_repo.go
+++ b/modules/repofiles/temp_repo.go
@@ -222,10 +222,10 @@ func (t *TemporaryUploadRepository) CommitTreeWithDate(author, committer *models
 				if committerSig.Name != authorSig.Name || committerSig.Email != authorSig.Email {
 					// Add trailers
 					_, _ = messageBytes.WriteString("\n")
-					_, _ = messageBytes.WriteString("Co-Authored-By: ")
+					_, _ = messageBytes.WriteString("Co-authored-by: ")
 					_, _ = messageBytes.WriteString(committerSig.String())
 					_, _ = messageBytes.WriteString("\n")
-					_, _ = messageBytes.WriteString("Co-Committed-By: ")
+					_, _ = messageBytes.WriteString("Co-committed-by: ")
 					_, _ = messageBytes.WriteString(committerSig.String())
 					_, _ = messageBytes.WriteString("\n")
 				}
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index 1d43c03017e..d7d6b751f6a 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -1525,7 +1525,7 @@ settings.trust_model.collaborator.long = Collaborator: Trust signatures by colla
 settings.trust_model.collaborator.desc = Valid signatures by collaborators of this repository will be marked "trusted" - (whether they match the committer or not). Otherwise, valid signatures will be marked "untrusted" if the signature matches the committer and "unmatched" if not.
 settings.trust_model.committer = Committer
 settings.trust_model.committer.long = Committer: Trust signatures that match committers (This matches GitHub and will force Gitea signed commits to have Gitea as the committer)
-settings.trust_model.committer.desc = Valid signatures will only be marked "trusted" if they match the committer, otherwise they will be marked "unmatched". This will force Gitea to be the committer on signed commits with the actual committer marked as Co-Authored-By: and Co-Committed-By: trailer in the commit. The default Gitea key must match a User in the database.
+settings.trust_model.committer.desc = Valid signatures will only be marked "trusted" if they match the committer, otherwise they will be marked "unmatched". This will force Gitea to be the committer on signed commits with the actual committer marked as Co-authored-by: and Co-committed-by: trailer in the commit. The default Gitea key must match a User in the database.
 settings.trust_model.collaboratorcommitter = Collaborator+Committer
 settings.trust_model.collaboratorcommitter.long = Collaborator+Committer: Trust signatures by collaborators which match the committer
 settings.trust_model.collaboratorcommitter.desc = Valid signatures by collaborators of this repository will be marked "trusted" if they match the committer. Otherwise, valid signatures will be marked "untrusted" if the signature matches the committer and "unmatched" otherwise. This will force Gitea to be marked as the committer on signed commits with the actual committer marked as Co-Authored-By: and Co-Committed-By: trailer in the commit. The default Gitea key must match a User in the database.
diff --git a/services/pull/merge.go b/services/pull/merge.go
index 2c4f939e0a5..9d6eadc524d 100644
--- a/services/pull/merge.go
+++ b/services/pull/merge.go
@@ -353,7 +353,7 @@ func rawMerge(pr *models.PullRequest, doer *models.User, mergeStyle models.Merge
 		} else {
 			if committer != sig {
 				// add trailer
-				message += fmt.Sprintf("\nCo-Authored-By: %s\nCo-Committed-By: %s\n", sig.String(), sig.String())
+				message += fmt.Sprintf("\nCo-authored-by: %s\nCo-committed-by: %s\n", sig.String(), sig.String())
 			}
 			if err := git.NewCommand("commit", signArg, fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email), "-m", message).RunInDirTimeoutEnvPipeline(env, -1, tmpBasePath, &outbuf, &errbuf); err != nil {
 				log.Error("git commit [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())