diff --git a/README.md b/README.md
index 89c6729..84ae405 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,9 @@ Command-line arguments take precedence over ENV vars.
 | baseURL               | GITHUB_BASE_URL              | Github Enterprise URL. _E.g._ `https://github.example.com/api/v3`                                                                                                                 |
 | uploadURL             | GITHUB_UPLOAD_URL            | Github Enterprise Upload URL to pass to the Github client                                                                                                                         |
 | insecure              | GITHUB_INSECURE              | Boolean to ignore SSL certificate check                                                                                                                                           | 
+| use-sha-for-pr        | GITHUB_USE_SHA_FOR_PR        | Boolean to use commit sha to find pull request. Used for cases when only commit sha is available and not pr number. Currently only supported for Comment type: `pr-review`        |                                                                                                                               | 
+| pr-state              | GITHUB_PR_STATE              | Pull request current state. (_e.g._ `open`, `closed`). Required for -use-sha-for-pr. Needed to filter pull requests to only one                                                   |                                                                            | 
+| base-branch           | GITHUB_PR_BASE_BRANCH        | Base branch of the Pull request. Required for -use-sha-for-pr.  Needed to filter pull requests to only one                                                                        |                                                      | 
 
 
 __NOTE__: The utility accepts the text of the comment from the command-line argument `comment`, from the ENV variable `GITHUB_COMMENT`, or from the standard input.
diff --git a/main.go b/main.go
index 295be23..8e9f323 100644
--- a/main.go
+++ b/main.go
@@ -51,6 +51,9 @@ var (
 	baseURL            = flag.String("baseURL", os.Getenv("GITHUB_BASE_URL"), "Base URL of github enterprise")
 	uploadURL          = flag.String("uploadURL", os.Getenv("GITHUB_UPLOAD_URL"), "Upload URL of github enterprise")
 	insecure           = flag.Bool("insecure", strings.ToLower(os.Getenv("GITHUB_INSECURE")) == "true", "Ignore SSL certificate check")
+	useCommitShaforPR  = flag.Bool("use-sha-for-pr", strings.ToLower(os.Getenv("GITHUB_USE_SHA_FOR_PR")) == "true", "Use commit sha to find PR number")
+	state              = flag.String("pr-state", os.Getenv("GITHUB_PR_STATE"), "State of the PR e.g closed,open. Default is open")
+	baseBranch         = flag.String("base-branch", os.Getenv("GITHUB_PR_BASE_BRANCH"), "Base branch of pull request")
 )
 
 func getPullRequestOrIssueNumber(str string) (int, error) {
@@ -66,6 +69,21 @@ func getPullRequestOrIssueNumber(str string) (int, error) {
 	return num, nil
 }
 
+
+func getPullRequestNumberFromSha( sha, state, base string, client *github.Client) (int, error) {
+
+	pullRequestsService := client.PullRequests
+	opts :=  &github.PullRequestListOptions {
+		State: state,
+		Base: base,
+	}
+	pullRequests,_,err :=  pullRequestsService.ListPullRequestsWithCommit(context.Background(), *owner, *repo, sha, opts, )
+	if err !=nil {
+		return 0, err
+	}
+	return *pullRequests[0].Number, nil
+}
+
 func getPullRequestFilePosition(str string) (int, error) {
 	if str == "" {
 		return 0, errors.New("-position or GITHUB_PR_FILE_POSITION required")
@@ -264,12 +282,30 @@ func main() {
 
 		log.Println("github-commenter: Created GitHub Commit comment", *commitComment.ID)
 	} else if *commentType == "pr-review" {
-		// https://developer.github.com/v3/pulls/reviews/#create-a-pull-request-review
-		num, err := getPullRequestOrIssueNumber(*number)
-		if err != nil {
-			log.Fatal(err)
+		var prNumber int
+		if *useCommitShaforPR  {
+			if *baseBranch == ""  ||  *state == "" {
+				flag.PrintDefaults()
+				log.Fatal("github-commenter: ( -pr-state or GITHUB_PR_STATE ) and ( -basebranch or GITHUB_PR_BASE_BRANCH )  must be provided when using flag -use-sha-for-pr ")
+			}
+			num,err := getPullRequestNumberFromSha(*sha, *state, *baseBranch, githubClient)
+			if err != nil{
+				log.Fatal(err)
+			}
+			prNumber = num
+
+		} else {
+			// https://developer.github.com/v3/pulls/reviews/#create-a-pull-request-review
+			num, err := getPullRequestOrIssueNumber(*number)
+			if err != nil {
+				log.Fatal(err)
+			}
+			prNumber = num
 		}
 
+		
+
+
 		comment, err := getComment()
 		if err != nil {
 			log.Fatal(err)
@@ -281,7 +317,7 @@ func main() {
 		}
 
 		pullRequestReviewRequest := &github.PullRequestReviewRequest{Body: &formattedComment, Event: github.String("COMMENT")}
-		pullRequestReview, _, err := githubClient.PullRequests.CreateReview(context.Background(), *owner, *repo, num, pullRequestReviewRequest)
+		pullRequestReview, _, err := githubClient.PullRequests.CreateReview(context.Background(), *owner, *repo, prNumber, pullRequestReviewRequest)
 		if err != nil {
 			log.Fatal(err)
 		}