diff --git a/r2/r2/config/routing.py b/r2/r2/config/routing.py
index 38f306189..2f4d7cbf9 100644
--- a/r2/r2/config/routing.py
+++ b/r2/r2/config/routing.py
@@ -303,6 +303,9 @@ def make_map():
                                  "add_roadblock|rm_roadblock")))
     mc('/api/:action', controller='apiminimal',
        requirements=dict(action="new_captcha"))
+    mc('/api/:type', controller='api',
+       requirements=dict(type='wikibannednote|bannednote'),
+       action='relnote')
     mc('/api/:action', controller='api')
 
     mc("/api/v1/:action", controller="oauth2frontend",
diff --git a/r2/r2/controllers/api.py b/r2/r2/controllers/api.py
index 2e490a05f..b9f9fcec5 100755
--- a/r2/r2/controllers/api.py
+++ b/r2/r2/controllers/api.py
@@ -813,6 +813,13 @@ class ApiController(RedditController, OAuth2ResourceController):
         c.user.add_friend_note(friend, note)
         form.set_html('.status', _("saved"))
 
+    @validatedForm(type = VOneOf('type', ('bannednote', 'wikibannednote')),
+                   user = VExistingUname('name'),
+                   note = VLength('note', 300))
+    def POST_relnote(self, form, jquery, type, user, note):
+        c.site.add_rel_note(type[:-4], user, note)
+        form.set_html('.status', _("saved"))
+
     @validatedForm(VUser(),
                    VModhash(),
                    ip=ValidIP())
diff --git a/r2/r2/models/subreddit.py b/r2/r2/models/subreddit.py
index 6e85aa8de..b4ef81776 100644
--- a/r2/r2/models/subreddit.py
+++ b/r2/r2/models/subreddit.py
@@ -883,6 +883,12 @@ class Subreddit(Thing, Printable):
             rel.update_permissions(**kwargs)
             rel._commit()
 
+    def add_rel_note(self, type, user, note):
+        rel = getattr(self, "get_%s" % type)(user)
+        if not rel:
+            raise ValueError("User is not %s." % type)
+        rel.note = note
+        rel._commit()
 
 class FakeSubreddit(Subreddit):
     over_18 = False