diff --git a/.travis.yml b/.travis.yml
index 74c230f9e..848e4421d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -35,7 +35,7 @@ script:
     if [[ "$TRAVIS_RUST_VERSION" == "nightly" ]]; then
         USE_SKEPTIC=1 cargo test
     else
-        cargo test
+        cargo test && cargo check --examples
     fi
   - |
     if [[ "$TRAVIS_RUST_VERSION" == "nightly" && $CLIPPY ]]; then
diff --git a/README.md b/README.md
index e5d824d70..0c53a7822 100644
--- a/README.md
+++ b/README.md
@@ -6,23 +6,25 @@ Protobuf support for actix-web framework.
 ## Example
 
 ```rust,ignore
-use actix_web::{HttpResponse, Result};
-use actix_protobuf::ProtoBuf;
+use actix_protobuf::*;
+use actix_web::*;
 
-#[derive(Clone, Debug, PartialEq, Message)]
+#[derive(Clone, PartialEq, Message)]
 pub struct MyObj {
-    #[prost(int32, tag="1")]
+    #[prost(int32, tag = "1")]
     pub number: i32,
-    #[prost(string, tag="2")]
+    #[prost(string, tag = "2")]
     pub name: String,
 }
 
-fn index(msg: ProtoBuf<MyObj>) -> Result<HttpResponse> {
+async fn index(msg: ProtoBuf<MyObj>) -> Result<HttpResponse> {
     println!("model: {:?}", msg);
-    HttpResponse::Ok().protobuf(msg.0)  // <- send response
+    HttpResponse::Ok().protobuf(msg.0) // <- send response
 }
 ```
 
+See [here](https://github.com/actix/actix-protobuf/tree/master/examples/prost-example) for the complete example.
+
 ## License
 
 This project is licensed under either of
diff --git a/examples/prost-example/client.py b/examples/prost-example/client.py
index 1f16270f4..939a71b5d 100755
--- a/examples/prost-example/client.py
+++ b/examples/prost-example/client.py
@@ -1,10 +1,10 @@
 #!/usr/bin/env python3
 # just start server and run client.py
 
-# wget https://github.com/google/protobuf/releases/download/v3.5.1/protobuf-python-3.5.1.zip
-# unzip protobuf-python-3.5.1.zip.1
-# cd protobuf-3.5.1/python/
-# python3.6 setup.py install
+# wget https://github.com/protocolbuffers/protobuf/releases/download/v3.11.2/protobuf-python-3.11.2.zip
+# unzip protobuf-python-3.11.2.zip.1
+# cd protobuf-3.11.2/python/
+# python3 setup.py install
 
 # pip3 install --upgrade pip
 # pip3 install aiohttp
diff --git a/examples/prost-example/test_pb2.py b/examples/prost-example/test_pb2.py
index 05e71f3a6..ea5a1d9d6 100644
--- a/examples/prost-example/test_pb2.py
+++ b/examples/prost-example/test_pb2.py
@@ -1,13 +1,11 @@
+# -*- coding: utf-8 -*-
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: test.proto
 
-import sys
-_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import message as _message
 from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
-from google.protobuf import descriptor_pb2
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -19,9 +17,9 @@ DESCRIPTOR = _descriptor.FileDescriptor(
   name='test.proto',
   package='',
   syntax='proto3',
-  serialized_pb=_b('\n\ntest.proto\"%\n\x05MyObj\x12\x0e\n\x06number\x18\x01 \x01(\x05\x12\x0c\n\x04name\x18\x02 \x01(\tb\x06proto3')
+  serialized_options=None,
+  serialized_pb=b'\n\ntest.proto\"%\n\x05MyObj\x12\x0e\n\x06number\x18\x01 \x01(\x05\x12\x0c\n\x04name\x18\x02 \x01(\tb\x06proto3'
 )
-_sym_db.RegisterFileDescriptor(DESCRIPTOR)
 
 
 
@@ -39,21 +37,21 @@ _MYOBJ = _descriptor.Descriptor(
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
-      options=None),
+      serialized_options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
       name='name', full_name='MyObj.name', index=1,
       number=2, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=_b("").decode('utf-8'),
+      has_default_value=False, default_value=b"".decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
-      options=None),
+      serialized_options=None, file=DESCRIPTOR),
   ],
   extensions=[
   ],
   nested_types=[],
   enum_types=[
   ],
-  options=None,
+  serialized_options=None,
   is_extendable=False,
   syntax='proto3',
   extension_ranges=[],
@@ -64,12 +62,13 @@ _MYOBJ = _descriptor.Descriptor(
 )
 
 DESCRIPTOR.message_types_by_name['MyObj'] = _MYOBJ
+_sym_db.RegisterFileDescriptor(DESCRIPTOR)
 
-MyObj = _reflection.GeneratedProtocolMessageType('MyObj', (_message.Message,), dict(
-  DESCRIPTOR = _MYOBJ,
-  __module__ = 'test_pb2'
+MyObj = _reflection.GeneratedProtocolMessageType('MyObj', (_message.Message,), {
+  'DESCRIPTOR' : _MYOBJ,
+  '__module__' : 'test_pb2'
   # @@protoc_insertion_point(class_scope:MyObj)
-  ))
+  })
 _sym_db.RegisterMessage(MyObj)