diff --git a/patchwork/forge/__init__.py b/patchwork/forge/__init__.py
index 25c76c26e1c1..8ac13d747874 100644
--- a/patchwork/forge/__init__.py
+++ b/patchwork/forge/__init__.py
@@ -182,6 +182,16 @@ class ForgeBackend(ABC):
         """
         raise NotImplementedError
 
+    @abstractmethod
+    def handle_comment_created(self, forge_config, comment, series):
+        """
+        Handle a comment on a patch or cover letter.
+
+        Called by the comment-created signal handler. The backend
+        decides whether to forward the comment to the forge PR.
+        """
+        raise NotImplementedError
+
 
 _backends = {}
 
@@ -219,6 +229,43 @@ def _on_series_completed(sender, instance, raw, **kwargs):
     transaction.on_commit(do_sync)
 
 
+def _on_comment_created(sender, instance, raw, **kwargs):
+    if raw:
+        return
+
+    if instance.category == Event.CATEGORY_PATCH_COMMENT_CREATED:
+        comment = instance.patch_comment
+        if not comment:
+            return
+        series = comment.patch.series
+    elif instance.category == Event.CATEGORY_COVER_COMMENT_CREATED:
+        comment = instance.cover_comment
+        if not comment:
+            return
+        series = comment.cover.series
+    else:
+        return
+
+    if not series:
+        return
+
+    def do_sync():
+        for forge_config in ForgeConfig.objects.filter(project=series.project):
+            backend = get_backend(forge_config.backend)
+            if not backend:
+                continue
+            try:
+                backend.handle_comment_created(forge_config, comment, series)
+            except Exception:
+                logger.exception(
+                    'forge comment sync failed for series %d on %s',
+                    series.id,
+                    forge_config.backend,
+                )
+
+    transaction.on_commit(do_sync)
+
+
 def load_backends():
     from django.db.models.signals import post_save
 
@@ -229,3 +276,4 @@ def load_backends():
         importlib.import_module(module_path)
 
     post_save.connect(_on_series_completed, sender=Event)
+    post_save.connect(_on_comment_created, sender=Event)
diff --git a/patchwork/forge/github/__init__.py b/patchwork/forge/github/__init__.py
index b2dbf23a5ee7..18200a4fdb23 100644
--- a/patchwork/forge/github/__init__.py
+++ b/patchwork/forge/github/__init__.py
@@ -15,6 +15,7 @@ import logging
 from patchwork.forge import ForgeBackend
 from patchwork.forge import register_backend
 from patchwork.forge.github.from_ml import create_or_update_pr
+from patchwork.forge.github.from_ml import post_pr_comment
 from patchwork.forge.github.to_ml import handle_check_pending
 from patchwork.forge.github.to_ml import handle_check_result
 from patchwork.forge.github.to_ml import handle_issue_comment
@@ -99,5 +100,8 @@ class GitHubBackend(ForgeBackend):
     def handle_series_completed(self, forge_config, series):
         create_or_update_pr(self, forge_config, series)
 
+    def handle_comment_created(self, forge_config, comment, series):
+        post_pr_comment(self, forge_config, comment, series)
+
 
 register_backend('github', GitHubBackend())
diff --git a/patchwork/forge/github/from_ml.py b/patchwork/forge/github/from_ml.py
index f648711ff0f3..1db2acc5463b 100644
--- a/patchwork/forge/github/from_ml.py
+++ b/patchwork/forge/github/from_ml.py
@@ -4,12 +4,14 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 
+import email
 import json
 import logging
 import urllib.error
 import urllib.request
 
 from patchwork.forge.git import GitMirror
+from patchwork.forge.util import COMMENT_MARKER
 from patchwork.forge.util import build_pr_body
 from patchwork.forge.util import forge_branch_name
 from patchwork.forge.util import series_from_forge
@@ -60,6 +62,17 @@ def create_pr(gh, forge_config, title, body, head, base):
     return result['number']
 
 
+def post_comment(gh, forge_config, pr_number, body):
+    owner, repo = forge_config.repo.split('/', 1)
+    gh_api_request(
+        gh,
+        forge_config,
+        'POST',
+        f'/repos/{owner}/{repo}/issues/{pr_number}/comments',
+        {'body': body},
+    )
+
+
 def base_branch(gh, forge_config):
     """
     Return the default branch of the GitHub repository.
@@ -74,17 +87,6 @@ def base_branch(gh, forge_config):
     return result['default_branch']
 
 
-def post_comment(gh, forge_config, pr_number, body):
-    owner, repo = forge_config.repo.split('/', 1)
-    gh_api_request(
-        gh,
-        forge_config,
-        'POST',
-        f'/repos/{owner}/{repo}/issues/{pr_number}/comments',
-        {'body': body},
-    )
-
-
 def create_or_update_pr(gh, forge_config, series):
     if not forge_config.sync_ml_to_forge:
         return
@@ -172,3 +174,26 @@ def store_series_metadata(gh, forge_config, series, pr_ref, branch):
         key=f'{forge_config.backend}_branch',
         defaults={'value': branch},
     )
+
+
+def post_pr_comment(gh, forge_config, comment, series):
+    if not forge_config.sync_ml_to_forge:
+        return
+
+    if comment.headers:
+        parsed = email.message_from_string(comment.headers)
+        hint = parsed.get('X-Patchwork-Hint', '')
+        if hint.lower() == 'ignore':
+            return
+
+    pr_meta = SeriesMetadata.objects.filter(
+        series=series, key=gh.meta_key_pr()
+    ).first()
+    if not pr_meta:
+        return
+
+    pr_number = int(pr_meta.value.rsplit('/', 1)[-1])
+    author = comment.submitter.name or comment.submitter.email
+    quoted = '\n'.join(f'> {line}' for line in comment.content.splitlines())
+    body = f'**{author}** commented:\n\n{quoted}\n\n{COMMENT_MARKER}'
+    post_comment(gh, forge_config, pr_number, body)