Add --host to README.md

Author: mmacy

README.md

@@ -135,9 +135,10 @@ In the steps below, "ClientID" is the same as "Application ID" or "AppId".
 $ pip install -r requirements.txt
 ```
 
-Run app.py from shell or command line. Note that the port needs to match what you've set up in your redirect_uri:
+Run app.py from shell or command line. Note that the host and port values need to match what you've set up in your redirect_uri:
+
 ```Shell
-$ flask run --port 5000
+$ flask run --host localhost --port 5000
 ```
 
 ## Community Help and Support

README_B2C.md

@@ -96,7 +96,7 @@ Configure the pythonwebapp project by making the following changes.
 
 ## Enable authentication
 
-Run app.py from shell or command line. Note that the port needs to match what you've set up in your **Redirect URI**:
+Run app.py from shell or command line. Note that the host and port values need to match what you've set up in your **Redirect URI**:
 
 ```Shell
 $ flask run --host localhost --port 5000