doc: clarify that __dirname is module local

Fixes: nodejs#5525
jasnell · Apr 2, 2016 · 53e1739 · 53e1739
1 parent 0928584
commit 53e1739
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/doc/api/globals.markdown b/doc/api/globals.markdown
@@ -30,6 +30,16 @@ console.log(__dirname);
 
 `__dirname` isn't actually a global but rather local to each module.
 
+For instance, given two modules: `a` and `b`, where `b` is a dependency of
+`a` and there is a directory structure of:
+
+* `/Users/mjr/app/a.js`
+* `/Users/mjr/app/node_modules/b/b.js`
+
+References to `__dirname` within `b.js` will return 
+`/Users/mjr/app/node_modules/b` while references to `__dirname` within `a.js`
+will return `/Users/mj/app`.
+
 ## \_\_filename
 
 <!-- type=var -->