Update README.md

README.md

@@ -81,7 +81,7 @@ You may pass them either as a module or through the command line (ie. `npm-licen
 {
   unknown: false,          // Boolean: generate only a list of unknown licenses
   start: '.',              // String: path to start the dependency checks
-  depth: 1,                // Number: how deep to recurse through the dependencies
+  depth: 'all',            // Number | 'all': how deep to recurse through the dependencies
   include: 'dependencies', // String | Array | 'all': recurse through various types of dependencies (https://npmjs.org/doc/json.html)
   meta: null               // String: path to a metadata json file (see below)
 }