diff --git a/README.md b/README.md
index be143dd..0519fd6 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ Resources are uploaded to `/gw-resources/{HOME_URL}/`. If you'd like a friendlie
 
 If you have problems uploading resources, check the [Permissive Uploads](#permissive-uploads) section.
 
-## API
+## Node.js API
 
 For most projects, you should only need to specify the `wordpress` config
 and use the `wordpress-deploy` task (or its alias `deploy`).
@@ -330,6 +330,26 @@ Synchronizes all resources in `path` to the WordPress site.
 * `path`: The directory containing resources to synchronize.
 * `callback` (`function( error )`): Callback to invoke after synchronizing all resources.
 
+## PHP API
+
+### Constants
+
+#### GW_VERSION
+
+The installed version of grunt-wordpress.
+
+#### GW_RESOURCE_DIR
+
+The path to the resources directory for the current site.
+
+### Methods
+
+#### gw_resources_dir( url )
+
+Gets the resources directory for a specific site.
+
+* `url`: The URL for the site.
+
 ## Permissive Uploads
 
 Depending on what resources you're uploading, you may need to change some WordPress settings.
diff --git a/grunt-wordpress.php b/grunt-wordpress.php
index bdff054..aea7dee 100644
--- a/grunt-wordpress.php
+++ b/grunt-wordpress.php
@@ -7,8 +7,11 @@
 define( 'GW_VERSION', '1.0.7' );
 
 if ( ! defined( 'GW_RESOURCE_DIR' ) )
-	define( 'GW_RESOURCE_DIR', dirname( WP_CONTENT_DIR ) . '/gw-resources/' .
-		preg_replace( '/^\w+:\/\//', '', home_url() ) );
+	define( 'GW_RESOURCE_DIR', gw_resources_dir( home_url() ) );
+
+function gw_resources_dir( $url ) {
+	return dirname( WP_CONTENT_DIR ) . '/gw-resources/' . preg_replace( '/^\w+:\/\//', '', $url );
+}
 
 function gw_get_version( $args ) {
 	global $wp_xmlrpc_server;