diff --git a/processor/rewrite-url.js b/processor/rewrite-url.js
index 6e375ad..3a756c1 100644
--- a/processor/rewrite-url.js
+++ b/processor/rewrite-url.js
@@ -78,6 +78,7 @@ var defaultConfig = {
 	 * for example, it is possible to add cache-busting tokens
 	 */
 	staticMap: {
+		img: ['src'],
 		script: ['src'],
 		link: ['href'],
 		video: ['src'],
@@ -104,6 +105,10 @@ function createConfig(config) {
 	if (config && config.rewriteMapAddon) {
 		out.rewriteMap = extend({}, defaultConfig.rewriteMap, config.rewriteMapAddon);
 	}
+	
+	if (config && config.staticMapAddon) {
+		out.staticMap = extend({}, defaultConfig.staticMap, config.staticMapAddon);
+	}
 
 	return out;
 }
@@ -252,4 +257,4 @@ module.exports = function(config) {
 
 module.exports.config = defaultConfig;
 module.exports.absoluteUrl = absoluteUrl;
-module.exports.rebuildUrl = rebuildUrl;
\ No newline at end of file
+module.exports.rebuildUrl = rebuildUrl;