diff --git a/lib/resin/data/fs-utils/fs-utils.coffee b/lib/resin/data/fs-utils/fs-utils.coffee
index efd68c93..b9cf2958 100644
--- a/lib/resin/data/fs-utils/fs-utils.coffee
+++ b/lib/resin/data/fs-utils/fs-utils.coffee
@@ -1,10 +1,33 @@
 fs = require('fs')
 _ = require('lodash')
 
-# TODO: There should be more complex checks here
+# Check if valid path
+#
+# @private
+#
+# @param {String} path path
+# @return {Boolean} is valid path
+#
+# @todo There should be more complex checks here
+#
+# @example Is valid path?
+#		console.log isValidPath('/Users/me') # True
+#		console.log isValidPath([ 1, 2, 3 ]) # False
+#
 exports.isValidPath = (p) ->
 	return _.isString(p)
 
+# Check if path is directory
+#
+# @private
+#
+# @param {String} directory directory
+# @param {Function} callback callback(error, isDirectory)
+#
+# @example Is directory?
+#		console.log isDirectory('/usr/local/share') # True
+#		console.log isDirectory('/Users/me/app.js') # False
+#
 exports.isDirectory = (directory, callback) ->
 	fs.stat directory, (error, stats) ->
 		return callback?(error) if error?