diff --git a/README.md b/README.md
index 21e8eab..7aa1bea 100644
--- a/README.md
+++ b/README.md
@@ -91,9 +91,11 @@ $ MICROBLOGPUB_DEBUG=1 FLASK_APP=app.py flask run -p 5005 --with-threads
 
 The user API is used by the admin UI (and requires a CSRF token when used with a regular user session), but it can also be accessed with an API key.
 
+All the examples are using [HTTPie](https://httpie.org/).
+
 ### POST /api/note/delete{?id}
 
-Delete the given note `id`.
+Deletes the given note `id`.
 
 Answers a **201** (Created) status code.
 
diff --git a/activitypub.py b/activitypub.py
index b63af90..1534a78 100644
--- a/activitypub.py
+++ b/activitypub.py
@@ -975,12 +975,13 @@ def parse_activity(payload: ObjectType, expected: Optional[ActivityType] = None)
         raise UnexpectedActivityTypeError(f'expected a {expected.name} activity, got a {payload["type"]}')
 
     if t not in _ACTIVITY_TYPE_TO_CLS:
-        raise BadActivityTypeError(f'unsupported activity type {payload["type"]}')
+        raise BadActivityError(f'unsupported activity type {payload["type"]}')
 
     activity = _ACTIVITY_TYPE_TO_CLS[t](**payload)
 
     return activity
 
+
 def gen_feed():
     fg = FeedGenerator()
     fg.id(f'{ID}')
diff --git a/app.py b/app.py
index 164e098..f305fa2 100644
--- a/app.py
+++ b/app.py
@@ -83,7 +83,7 @@ JWT_SECRET = get_secret_key('jwt')
 JWT = JSONWebSignatureSerializer(JWT_SECRET)
 
 def _admin_jwt_token() -> str:
-    return JWT.dumps({'me': 'ADMIN', 'ts': datetime.now().timestamp()}).decode('utf-8')
+    return JWT.dumps({'me': 'ADMIN', 'ts': datetime.now().timestamp()}).decode('utf-8')  # type: ignore
 
 ADMIN_API_KEY = get_secret_key('admin_api_key', _admin_jwt_token)