diff --git a/completers/gh_completer/cmd/action/pullrequest.go b/completers/gh_completer/cmd/action/pullrequest.go
index 401f75e5a4..7058a9685a 100644
--- a/completers/gh_completer/cmd/action/pullrequest.go
+++ b/completers/gh_completer/cmd/action/pullrequest.go
@@ -155,3 +155,28 @@ func ActionPullRequestReviewers(cmd *cobra.Command, id string) carapace.Action {
 		return carapace.ActionValues(vals...)
 	})
 }
+
+type commit struct {
+	Sha    string
+	Commit struct {
+		Message string
+	}
+}
+
+func ActionPullRequestCommits(cmd *cobra.Command, id string) carapace.Action {
+	return carapace.ActionCallback(func(c carapace.Context) carapace.Action {
+		repo, err := repoOverride(cmd)
+		if err != nil {
+			return carapace.ActionMessage(err.Error())
+		}
+
+		var queryResult []commit
+		return ApiV3Action(cmd, fmt.Sprintf(`repos/%v/%v/pulls/%v/commits`, repo.RepoOwner(), repo.RepoName(), id), &queryResult, func() carapace.Action {
+			vals := make([]string, 0)
+			for _, c := range queryResult {
+				vals = append(vals, c.Sha, c.Commit.Message)
+			}
+			return carapace.ActionValuesDescribed(vals...)
+		})
+	})
+}
diff --git a/completers/gh_completer/cmd/pr_merge.go b/completers/gh_completer/cmd/pr_merge.go
index 682adb9bc4..6efd2d9d7f 100644
--- a/completers/gh_completer/cmd/pr_merge.go
+++ b/completers/gh_completer/cmd/pr_merge.go
@@ -31,6 +31,12 @@ func init() {
 	carapace.Gen(pr_mergeCmd).FlagCompletion(carapace.ActionMap{
 		"body":      action.ActionKeywordLinks(pr_mergeCmd),
 		"body-file": carapace.ActionFiles(),
+		"match-head-commit": carapace.ActionCallback(func(c carapace.Context) carapace.Action {
+			if len(c.Args) > 0 {
+				return action.ActionPullRequestCommits(pr_mergeCmd, c.Args[0])
+			}
+			return carapace.ActionValues()
+		}),
 	})
 
 	carapace.Gen(pr_mergeCmd).PositionalCompletion(