diff --git a/tests/webapp/api/test_bugzilla.py b/tests/webapp/api/test_bugzilla.py
index 7f6d09f5508..4d6c934aa7f 100644
--- a/tests/webapp/api/test_bugzilla.py
+++ b/tests/webapp/api/test_bugzilla.py
@@ -209,6 +209,78 @@ def request_callback(request):
     assert resp.json()["detail"] == "Authentication credentials were not provided."
 
 
+def test_post_comment(client, activate_responses, test_user):
+    """
+    test successfully posting a comment to a Bugzilla bug
+    """
+
+    def request_callback(request):
+        headers = {}
+        requestdata = json.loads(request.body)
+        requestheaders = request.headers
+        assert requestheaders["x-bugzilla-api-key"] == "12345helloworld"
+        assert requestdata["comment"] == "Performance improvement detected."
+        assert requestdata["comment_tags"] == ["perf-alert"]
+        resp_body = {"id": 101}
+        return (200, headers, json.dumps(resp_body))
+
+    responses.add_callback(
+        responses.POST,
+        "https://thisisnotbugzilla.org/rest/bug/323/comment",
+        callback=request_callback,
+        content_type="application/json",
+    )
+
+    client.force_authenticate(user=test_user)
+
+    resp = client.post(
+        reverse("bugzilla-post-comment"),
+        {"bug_id": 323, "comment": "Performance improvement detected."},
+    )
+    assert resp.status_code == 200
+    assert resp.json()["id"] == 101
+
+
+def test_post_comment_missing_bug_id(client, activate_responses, test_user):
+    """
+    test that post_comment returns 400 when bug_id is missing
+    """
+    client.force_authenticate(user=test_user)
+
+    resp = client.post(
+        reverse("bugzilla-post-comment"),
+        {"comment": "Performance improvement detected."},
+    )
+    assert resp.status_code == 400
+    assert resp.json()["failure"] == "bug_id is required"
+
+
+def test_post_comment_missing_comment(client, activate_responses, test_user):
+    """
+    test that post_comment returns 400 when comment is missing
+    """
+    client.force_authenticate(user=test_user)
+
+    resp = client.post(
+        reverse("bugzilla-post-comment"),
+        {"bug_id": 323},
+    )
+    assert resp.status_code == 400
+    assert resp.json()["failure"] == "comment is required"
+
+
+def test_post_comment_unauthenticated(client, activate_responses):
+    """
+    test that post_comment requires authentication
+    """
+    resp = client.post(
+        reverse("bugzilla-post-comment"),
+        {"bug_id": 323, "comment": "Performance improvement detected."},
+    )
+    assert resp.status_code == 403
+    assert resp.json()["detail"] == "Authentication credentials were not provided."
+
+
 def test_create_bug_with_long_crash_signature(
     client, eleven_jobs_stored, activate_responses, test_user
 ):
diff --git a/treeherder/webapp/api/bugzilla.py b/treeherder/webapp/api/bugzilla.py
index d4e10015ef0..51544c67208 100644
--- a/treeherder/webapp/api/bugzilla.py
+++ b/treeherder/webapp/api/bugzilla.py
@@ -121,3 +121,41 @@ def create_bug(self, request):
                 "url": get_bug_url(bug_id, settings.BUGFILER_API_URL),
             }
         )
+
+    @action(detail=False, methods=["post"])
+    def post_comment(self, request):
+        """
+        Post a comment to an existing Bugzilla bug
+        """
+        if settings.BUGFILER_API_KEY is None:
+            return Response({"failure": "Bugzilla API key not set!"}, status=HTTP_400_BAD_REQUEST)
+
+        params = request.data
+        bug_id = params.get("bug_id")
+        comment = params.get("comment")
+
+        if not bug_id:
+            return Response({"failure": "bug_id is required"}, status=HTTP_400_BAD_REQUEST)
+        if not comment:
+            return Response({"failure": "comment is required"}, status=HTTP_400_BAD_REQUEST)
+
+        url = f"{settings.BUGFILER_API_URL}/rest/bug/{bug_id}/comment"
+        headers = {
+            "x-bugzilla-api-key": settings.BUGFILER_API_KEY,
+            "Accept": "application/json",
+        }
+        data = {
+            "comment": comment,
+            "comment_tags": ["perf-alert"],
+        }
+
+        try:
+            response = make_request(url, method="POST", headers=headers, json=data)
+        except requests.exceptions.HTTPError as e:
+            try:
+                message = e.response.json()["message"]
+            except (ValueError, KeyError):
+                message = e.response.text
+            return Response({"failure": message}, status=HTTP_400_BAD_REQUEST)
+
+        return Response({"id": response.json().get("id")})
diff --git a/ui/perfherder/alerts/FileBugModal.jsx b/ui/perfherder/alerts/FileBugModal.jsx
index 4b53a47eb33..3963562d4b3 100644
--- a/ui/perfherder/alerts/FileBugModal.jsx
+++ b/ui/perfherder/alerts/FileBugModal.jsx
@@ -56,6 +56,7 @@ export default class FileBugModal extends React.Component {
       submitButtonText,
       user,
       errorMessage,
+      requireInput,
     } = this.props;
 
     const { inputValue, invalidInput, validated, disableButton } = this.state;
@@ -80,7 +81,7 @@ export default class FileBugModal extends React.Component {
                 <Row className="justify-content-left">
                   <Col className="col-6">
                     <Form.Label htmlFor="culpritBugId">
-                      {title} <i>(optional): </i>
+                      {title}{requireInput ? ':' : <i> (optional): </i>}
                       <span className="text-secondary">
                         <FontAwesomeIcon icon={faInfoCircle} title={infoText} />
                       </span>
@@ -114,7 +115,7 @@ export default class FileBugModal extends React.Component {
               <Button
                 className="btn-outline-darker-info active"
                 onClick={(event) => this.handleSubmit(event, inputValue)}
-                disabled={(invalidInput && !validated) || disableButton}
+                disabled={(invalidInput && !validated) || (requireInput && !inputValue.length) || disableButton}
                 type="submit"
               >
                 {(inputValue.length &&
@@ -146,4 +147,9 @@ FileBugModal.propTypes = {
   title: PropTypes.string.isRequired,
   submitButtonText: PropTypes.string.isRequired,
   user: PropTypes.shape({}).isRequired,
+  requireInput: PropTypes.bool,
+};
+
+FileBugModal.defaultProps = {
+  requireInput: false,
 };
diff --git a/ui/perfherder/alerts/StatusDropdown.jsx b/ui/perfherder/alerts/StatusDropdown.jsx
index d65ed65d108..78444c28356 100644
--- a/ui/perfherder/alerts/StatusDropdown.jsx
+++ b/ui/perfherder/alerts/StatusDropdown.jsx
@@ -37,6 +37,7 @@ export default class StatusDropdown extends React.Component {
       showBugModal: false,
       showFileBugModal: false,
       showCriticalFileBugModal: false,
+      showAddCommentModal: false,
       showNotesModal: false,
       showTagsModal: false,
       selectedValue: issueTrackers[0]?.text,
@@ -46,6 +47,7 @@ export default class StatusDropdown extends React.Component {
       ),
       isWeekend: isWeekend(),
       fileBugErrorMessage: null,
+      addCommentErrorMessage: null,
     };
   }
 
@@ -317,6 +319,84 @@ export default class StatusDropdown extends React.Component {
     }
   };
 
+  addComment = async (bugId) => {
+    const {
+      alertSummary,
+      repoModel,
+      updateViewState,
+      filteredAlerts = [],
+      frameworks,
+      user,
+    } = this.props;
+    const { browsertimeAlertsExtraData } = this.state;
+
+    const perfCompareURL = getPerfCompareBaseURL(
+      alertSummary.repository,
+      alertSummary.prev_push_revision,
+      alertSummary.repository,
+      alertSummary.revision,
+      alertSummary.framework,
+    );
+
+    const result = await this.getBugTemplate(
+      alertSummary.framework,
+      updateViewState,
+    );
+    if (!result) {
+      return { failureStatus: 'Failed to retrieve bug template' };
+    }
+
+    const textualSummary = new TextualSummary(
+      frameworks,
+      filteredAlerts,
+      alertSummary,
+      null,
+      await browsertimeAlertsExtraData.enrichAndRetrieveAlerts(),
+    );
+    const templateArgs = this.getTemplateArgs(
+      frameworks,
+      alertSummary,
+      repoModel,
+      textualSummary,
+      user,
+      perfCompareURL,
+    );
+
+    templateSettings.interpolate = /{{([\s\S]+?)}}/g;
+    const fillTemplate = template(result.no_action_required_text);
+    const commentText = fillTemplate(templateArgs);
+    console.log(`commentText: ${commentText}`);
+
+    const createResult = await create(getApiUrl('/bugzilla/post_comment/'), {
+      bug_id: bugId,
+      comment: commentText,
+    });
+    if (createResult.failureStatus) {
+      return {
+        failureStatus: createResult.failureStatus,
+        data: createResult.data,
+      };
+    }
+    window.open(`${bzBaseUrl}show_bug.cgi?id=${bugId}`);
+    this.changeAlertSummary({ bug_number: bugId });
+
+    return { failureStatus: null };
+  };
+
+  addCommentAndClose = async (event, params, state) => {
+    event.preventDefault();
+    const bugId = params.bug_number;
+    const result = await this.addComment(bugId);
+
+    if (result.failureStatus) {
+      this.setState({
+        addCommentErrorMessage: `Failure: ${result.data}`,
+      });
+    } else {
+      this.toggle(state);
+    }
+  };
+
   changeAlertSummary = async (params) => {
     const { alertSummary, updateState, updateViewState } = this.props;
 
@@ -356,6 +436,7 @@ export default class StatusDropdown extends React.Component {
       showBugModal,
       showFileBugModal,
       showCriticalFileBugModal,
+      showAddCommentModal,
       showNotesModal,
       showTagsModal,
       selectedValue,
@@ -457,6 +538,23 @@ export default class StatusDropdown extends React.Component {
           user={user}
           errorMessage={this.state.fileBugErrorMessage}
         />
+        <FileBugModal
+          showModal={showAddCommentModal}
+          toggle={() => this.toggle('showAddCommentModal')}
+          updateAndClose={(event, inputValue) =>
+            this.addCommentAndClose(
+              event,
+              { bug_number: parseInt(inputValue, 10) },
+              'showAddCommentModal',
+            )
+          }
+          header="Add Comment to Bug"
+          title="Enter Bug Number"
+          submitButtonText="Add Comment"
+          requireInput
+          user={user}
+          errorMessage={this.state.addCommentErrorMessage}
+        />
         <NotesModal
           showModal={showNotesModal}
           toggle={() => this.toggle('showNotesModal')}
@@ -524,6 +622,12 @@ export default class StatusDropdown extends React.Component {
                     Unlink from bug
                   </Dropdown.Item>
                 )}
+                <Dropdown.Item
+                  as="a"
+                  onClick={() => this.toggle('showAddCommentModal')}
+                >
+                  Add comment to bug
+                </Dropdown.Item>
                 <Dropdown.Item
                   as="a"
                   onClick={() => this.toggle('showNotesModal')}