readme.md in invoker-0.0.2 vs readme.md in invoker-0.0.3

@@ -42,16 +42,26 @@
     ~> invoker remove dj -s 9
 
     # add and start running
     ~> invoker add dj
     
-You can also enable OSX notifications for crashed processes by installing `terminal-notification` gem. It is not a dependency, but can be useful if something crashed and you weren't paying attention.    
-    
+You can also enable OSX notifications for crashed processes by installing `terminal-notification` gem. It is not a dependency, but can be useful if something crashed and you weren't paying attention.   
 
-## Bug reports, Feature requests ## 
+## Using with rbenv or rvm ##
 
-Please use [Github Issue Tracker](https://github.com/code-mancers/invoker/issues) for feature requests or bug reports.
+The way `rbenv` and `rvm` work sometimes creates problems when you are trying to use a process supervisor like `invoker`. There are couple of things to keep in mind,
+If you are running `invoker` with Ruby version x, but your application requires Ruby version Y:
 
+* When using `rbenv`, you can define the command with environment variable `RBENV_VERSION=Y` and then start your application. In other words:
+ 
+        command = RBENV_VERSION=2.0.0-p0 zsh -c "bundle exec rails s"
 
+* Unless version of Ruby using which you are running `invoker` command and version of Ruby you are using in the application is same, you almost always will want to use 
+`zsh -c` or `bash -c`. `RVM` in particular requires a login shell and hence sometimes you may have to use `bash -lc`. For example:
 
+        command = bash -lc "rvm use 2.0.0-p0 && bundle exec rails s"
+    
 
+## Bug reports and Feature requests
+
+Please use [Github Issue Tracker](https://github.com/code-mancers/invoker/issues) for feature requests or bug reports.