diff --git a/__tests__/comment.test.ts b/__tests__/comment.test.ts
index b57f2d9..578c3ff 100644
--- a/__tests__/comment.test.ts
+++ b/__tests__/comment.test.ts
@@ -67,6 +67,14 @@ it("updateComment", async () => {
     comment_id: 456,
     body: "<!-- Sticky Pull Request CommentTypeA -->\nhello there"
   });
+
+  expect(
+    await updateComment(octokit, repo, 456, "hello there", "TypeA", "<!-- Sticky Pull Request CommentTypeA -->\nhello there")
+  ).toBeUndefined();
+  expect(octokit.issues.updateComment).toBeCalledWith({
+    comment_id: 456,
+    body: "<!-- Sticky Pull Request CommentTypeA -->\nhello there\nhello there"
+  });
 });
 it("createComment", async () => {
   const octokit = {
diff --git a/action.yml b/action.yml
index 571964f..eb083b3 100644
--- a/action.yml
+++ b/action.yml
@@ -5,6 +5,9 @@ inputs:
   header:
     description: "Header to determine if the comment is to be updated, not shown on screen"
     required: false
+  append:
+    description: "Indicate if new comment messages should be appended to previous comment message"
+    required: false
   message:
     description: "comment message"
     required: true
diff --git a/lib/comment.js b/lib/comment.js
index 2e4aabb..1fd06d5 100644
--- a/lib/comment.js
+++ b/lib/comment.js
@@ -20,9 +20,9 @@ function findPreviousComment(octokit, repo, issue_number, header) {
     });
 }
 exports.findPreviousComment = findPreviousComment;
-function updateComment(octokit, repo, comment_id, body, header) {
+function updateComment(octokit, repo, comment_id, body, header, previousBody) {
     return __awaiter(this, void 0, void 0, function* () {
-        yield octokit.issues.updateComment(Object.assign(Object.assign({}, repo), { comment_id, body: `${headerComment(header)}\n${body}` }));
+        yield octokit.issues.updateComment(Object.assign(Object.assign({}, repo), { comment_id, body: previousBody ? `${previousBody}\n${body}` : `${headerComment(header)}\n${body}` }));
     });
 }
 exports.updateComment = updateComment;
diff --git a/lib/main.js b/lib/main.js
index 913c4aa..79facda 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -20,9 +20,9 @@ const core = __importStar(require("@actions/core"));
 const github_1 = require("@actions/github");
 const comment_1 = require("./comment");
 function run() {
-    var _a, _b, _c;
+    var _a, _b;
     return __awaiter(this, void 0, void 0, function* () {
-        const number = ((_c = (_b = (_a = github_1.context) === null || _a === void 0 ? void 0 : _a.payload) === null || _b === void 0 ? void 0 : _b.pull_request) === null || _c === void 0 ? void 0 : _c.number) ||
+        const number = ((_b = (_a = github_1.context === null || github_1.context === void 0 ? void 0 : github_1.context.payload) === null || _a === void 0 ? void 0 : _a.pull_request) === null || _b === void 0 ? void 0 : _b.number) ||
             +core.getInput("number", { required: false });
         if (isNaN(number) || number < 1) {
             core.info("no numbers given: skip step");
@@ -32,11 +32,17 @@ function run() {
             const repo = github_1.context.repo;
             const body = core.getInput("message", { required: true });
             const header = core.getInput("header", { required: false }) || "";
+            const append = core.getInput("append", { required: false }) || false;
             const githubToken = core.getInput("GITHUB_TOKEN", { required: true });
             const octokit = new github_1.GitHub(githubToken);
             const previous = yield comment_1.findPreviousComment(octokit, repo, number, header);
             if (previous) {
-                yield comment_1.updateComment(octokit, repo, previous.id, body, header);
+                if (append) {
+                    yield comment_1.updateComment(octokit, repo, previous.id, body, header, previous.body);
+                }
+                else {
+                    yield comment_1.updateComment(octokit, repo, previous.id, body, header);
+                }
             }
             else {
                 yield comment_1.createComment(octokit, repo, number, body, header);
diff --git a/src/comment.ts b/src/comment.ts
index 7544984..b311a86 100644
--- a/src/comment.ts
+++ b/src/comment.ts
@@ -10,11 +10,11 @@ export async function findPreviousComment(octokit, repo, issue_number, header) {
   const h = headerComment(header);
   return comments.find(comment => comment.body.startsWith(h));
 }
-export async function updateComment(octokit, repo, comment_id, body, header) {
+export async function updateComment(octokit, repo, comment_id, body, header, previousBody?) {
   await octokit.issues.updateComment({
     ...repo,
     comment_id,
-    body: `${headerComment(header)}\n${body}`
+    body: previousBody ? `${previousBody}\n${body}` : `${headerComment(header)}\n${body}`
   });
 }
 export async function createComment(octokit, repo, issue_number, body, header) {
diff --git a/src/main.ts b/src/main.ts
index ed8e2f4..c83c9ff 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -15,11 +15,16 @@ async function run() {
     const repo = context.repo;
     const body = core.getInput("message", { required: true });
     const header = core.getInput("header", { required: false }) || "";
+    const append = core.getInput("append", { required: false }) || false;
     const githubToken = core.getInput("GITHUB_TOKEN", { required: true });
     const octokit = new GitHub(githubToken);
     const previous = await findPreviousComment(octokit, repo, number, header);
     if (previous) {
-      await updateComment(octokit, repo, previous.id, body, header);
+      if (append) {
+        await updateComment(octokit, repo, previous.id, body, header, previous.body);
+      } else {
+        await updateComment(octokit, repo, previous.id, body, header);
+      }
     } else {
       await createComment(octokit, repo, number, body, header);
     }