Add TOOL_NODE_FLAGS as a tip on the DEVELOPMENT.md file. This is alre…

…ady documented in the Environment Variables file, but it's a bit hidden.

DEVELOPMENT.md

@@ -43,13 +43,19 @@ can run Meteor directly from a Git checkout using these steps:
     $ /path/to/meteor-checkout/meteor run
     ```
 
-    > _Tip:_ Consider making an easy-to-run alias for frequent use:
+    > _Tip 1:_ Consider making an easy-to-run alias for frequent use:
     >
     >     alias mymeteor=/path/to-meteor-checkout/meteor
     >
     > This allows the use of `mymeteor` in place of `meteor`.  To persist this
     > across shell logouts, simply add it to `~/.bashrc` or `.zshrc`.
 
+    > _Tip 2:_ When working with meteor tool, it may be helpful to use the debugger to check what's happening. You can do this using the following flag:
+    >
+    >        TOOL_NODE_FLAGS="--inspect-brk" mymeteor
+    > 
+    > Then you can use the chrome debugger inside `chrome://inspect`.
+
 ### Notes when running from a checkout
 
 The following are some distinct differences you must pay attention to when running Meteor from a checkout: