diff --git a/ghutil/ghutil.go b/ghutil/ghutil.go
index 5866fa3..3083df4 100644
--- a/ghutil/ghutil.go
+++ b/ghutil/ghutil.go
@@ -35,6 +35,9 @@ const (
 	LabelClaYes      = "cla: yes"
 	LabelClaNo       = "cla: no"
 	LabelClaExternal = "cla: external"
+
+	ReviewRequestChanges = "REQUEST_CHANGES"
+	ReviewApprove        = "APPROVE"
 )
 
 // OrganizationsService is the subset of `github.OrganizationsService` used by
@@ -61,6 +64,7 @@ type IssuesService interface {
 // PullRequestsService is the subset of `github.PullRequestsService` used by
 // this module.
 type PullRequestsService interface {
+	CreateReview(ctx context.Context, owner string, repo string, number int, review *github.PullRequestReviewRequest) (*github.PullRequestReview, *github.Response, error)
 	List(ctx context.Context, owner string, repo string, opt *github.PullRequestListOptions) ([]*github.PullRequest, *github.Response, error)
 	ListCommits(ctx context.Context, owner string, repo string, number int, opt *github.ListOptions) ([]*github.RepositoryCommit, *github.Response, error)
 }
@@ -380,15 +384,16 @@ func (ghc *GitHubClient) ProcessPullRequest(ctx context.Context, orgName string,
 			}
 		}
 
-		addComment := func(comment string) {
-			logging.Infof("  Adding comment to repo '%s/%s/ PR %d: %s", orgName, repoName, *pull.Number, comment)
+		addReview := func(review string, event string) {
+			logging.Infof("  Adding %s review to repo '%s/%s/ PR %d: %s", event, orgName, repoName, *pull.Number, review)
 			if updateRepo {
-				issueComment := github.IssueComment{
-					Body: &comment,
+				prReview := github.PullRequestReviewRequest{
+					Body:  &review,
+					Event: &event,
 				}
-				_, _, err := ghc.Issues.CreateComment(ctx, orgName, repoName, *pull.Number, &issueComment)
+				_, _, err := ghc.PullRequests.CreateReview(ctx, orgName, repoName, *pull.Number, &prReview)
 				if err != nil {
-					logging.Errorf("  Error leaving comment on PR %d: %v", *pull.Number, err)
+					logging.Errorf("  Error leaving review on PR %d: %v", *pull.Number, err)
 				}
 			} else {
 				logging.Info("  ... but -update-repo flag is disabled; skipping")
@@ -409,26 +414,23 @@ func (ghc *GitHubClient) ProcessPullRequest(ctx context.Context, orgName string,
 			} else {
 				logging.Infof("  No action needed: [%s] label already added", LabelClaYes)
 			}
+
+			addReview(pullRequestNonComplianceReason, ReviewApprove)
 		} else /* !pullRequestIsCompliant */ {
-			labelsUpdatedForNonCompliance := false
 			// if PR doesn't have [cla: no] label, add it.
 			if !hasLabelClaNo {
 				addLabel(LabelClaNo)
-				labelsUpdatedForNonCompliance = true
 			} else {
 				logging.Infof("  No action needed: [%s] label already added", LabelClaNo)
 			}
 			// if PR has [cla: yes] label, remove it.
 			if hasLabelClaYes {
 				removeLabel(LabelClaYes)
-				labelsUpdatedForNonCompliance = true
 			} else {
 				logging.Infof("  No action needed: [%s] label already missing", LabelClaYes)
 			}
 
-			if labelsUpdatedForNonCompliance {
-				addComment(pullRequestNonComplianceReason)
-			}
+			addReview(pullRequestNonComplianceReason, ReviewRequestChanges)
 		}
 	}
 	return nil
diff --git a/ghutil/ghutil_test.go b/ghutil/ghutil_test.go
index de14049..40acf85 100644
--- a/ghutil/ghutil_test.go
+++ b/ghutil/ghutil_test.go
@@ -442,3 +442,103 @@ func TestCheckPullRequestCompliance_OneCompliantOneNot(t *testing.T) {
 	assert.Equal(t, "Committer of one or more commits is not listed as a CLA signer, either individual or as a member of an organization.", nonComplianceReason)
 	assert.Nil(t, err)
 }
+
+func TestCheckProcessPullRequest_Compliant_Approve(t *testing.T) {
+	setUp(t)
+	defer tearDown(t)
+
+	expectRepoLabels(orgName, repoName, true, true, false)
+	repoClaLabelStatus := ghc.GetRepoClaLabelStatus(ctx, orgName, repoName)
+
+	claSigners := config.ClaSigners{
+		People: []config.Account{
+			{
+				Name:  "John Doe",
+				Email: "john@example.com",
+				Login: "john-doe",
+			},
+		},
+	}
+	var prNum = 42
+	var num *int
+	num = &prNum
+	var prTitle = "Fix Things"
+	var title *string
+	title = &prTitle
+	pull := &github.PullRequest{Number: num, Title: title}
+
+	var commits []*github.RepositoryCommit
+	mockGhc.PullRequests.EXPECT().ListCommits(ctx, orgName, repoName, pullNumber, nil).Return(commits, nil, nil)
+	mockGhc.Issues.EXPECT().ListLabelsByIssue(ctx, orgName, repoName, prNum, nil).Return(nil, nil, nil)
+	mockGhc.Issues.EXPECT().AddLabelsToIssue(ctx, orgName, repoName, prNum, []string{"cla: yes"}).Return(nil, nil, nil)
+	var reviewBody = ""
+	var body *string
+	body = &reviewBody
+	var reviewEvent = "APPROVE"
+	var event *string
+	event = &reviewEvent
+	var prReview = github.PullRequestReviewRequest{
+		Body:  body,
+		Event: event,
+	}
+	mockGhc.PullRequests.EXPECT().CreateReview(ctx, orgName, repoName, prNum, &prReview).Return(nil, nil, nil)
+	err := ghc.ProcessPullRequest(ctx, orgName, repoName, pull, claSigners, repoClaLabelStatus, true)
+	assert.Nil(t, err)
+}
+
+func TestCheckProcessPullRequest_NotCompliant_RequestChanges(t *testing.T) {
+	setUp(t)
+	defer tearDown(t)
+
+	expectRepoLabels(orgName, repoName, true, true, false)
+	repoClaLabelStatus := ghc.GetRepoClaLabelStatus(ctx, orgName, repoName)
+
+	sha1 := "12345abcde"
+	name1 := "John Doe"
+	email1 := "john@example.com"
+	login1 := "john-doe"
+
+	sha2 := "abcde24680"
+	name2 := "Jane Doe"
+	email2 := "jane@example.com"
+	login2 := "jane-doe"
+
+	commits := []*github.RepositoryCommit{
+		createCommit(sha1, name1, email1, login1),
+		createCommit(sha2, name2, email2, login2),
+	}
+
+	claSigners := config.ClaSigners{
+		People: []config.Account{
+			{
+				Name:  name1,
+				Email: email1,
+				Login: login1,
+			},
+		},
+	}
+	var prNum = 42
+	var num *int
+	num = &prNum
+	var prTitle = "Fix Things"
+	var title *string
+	title = &prTitle
+	pull := &github.PullRequest{Number: num, Title: title}
+
+	mockGhc.PullRequests.EXPECT().ListCommits(ctx, orgName, repoName, pullNumber, nil).Return(commits, nil, nil)
+	mockGhc.Issues.EXPECT().ListLabelsByIssue(ctx, orgName, repoName, prNum, nil).Return(nil, nil, nil)
+	mockGhc.Issues.EXPECT().AddLabelsToIssue(ctx, orgName, repoName, prNum, []string{"cla: no"}).Return(nil, nil, nil)
+	var reviewBody = "Committer of one or more commits is not listed as a CLA signer, either individual or as a member of an organization."
+	var body *string
+	body = &reviewBody
+	var reviewEvent = "REQUEST_CHANGES"
+	var event *string
+	event = &reviewEvent
+	var prReview = github.PullRequestReviewRequest{
+		Body:  body,
+		Event: event,
+	}
+	mockGhc.PullRequests.EXPECT().CreateReview(ctx, orgName, repoName, prNum, &prReview).Return(nil, nil, nil)
+	err := ghc.ProcessPullRequest(ctx, orgName, repoName, pull, claSigners, repoClaLabelStatus, true)
+	assert.Nil(t, err)
+}