add url to issue

README.md

@@ -76,7 +76,7 @@ TIPS
 One of the setting I find useful to enable is `l5-swagger.generate_always`, which will cause your Swagger doc to be regenerated each time you load the Swagger UI (<span style="color:OrangeRed">not intended for production use!</span>). All you have to do to enable this in your dev environment is add an environment variable to `.env` named `L5_SWAGGER_GENERATE_ALWAYS` and set it to `true`.
 
 ## oauth2 + passport = Bearer \<token\>
-Follow instruction in issue #57.
+Follow instruction in [issue #57](https://github.com/DarkaOnLine/L5-Swagger/issues/57).
 
 Changes in 5.0
 ============