diff --git a/README.md b/README.md
index 2bb21385..a5781f66 100644
--- a/README.md
+++ b/README.md
@@ -490,7 +490,15 @@ console.log(result.map);
 
 Note that the source map is not saved in a file, it's just returned in
 `result.map`.  The value passed for `outSourceMap` is only used to set the
-`file` attribute in the source map (see [the spec][sm-spec]).
+`file` attribute in the source map (see [the spec][sm-spec]). The value set
+in the `//# sourceMappingURL` comment defaults to `outSourceMap`, but this
+can be overridden by setting the `sourceMapURL` parameter:
+```javascript
+var result = UglifyJS.minify([ "file1.js", "file2.js", "file3.js" ], {
+	outSourceMap: "out.js.map",
+	sourceMapURL: "sourcemaps/out.js.map",
+});
+```
 
 You can also specify sourceRoot property to be included in source map:
 ```javascript
diff --git a/tools/node.js b/tools/node.js
index 1ae69da8..117c02da 100644
--- a/tools/node.js
+++ b/tools/node.js
@@ -57,6 +57,7 @@ exports.minify = function(files, options) {
         outSourceMap : null,
         sourceRoot   : null,
         inSourceMap  : null,
+        sourceMapURL : null,
         fromString   : false,
         warnings     : false,
         mangle       : {},
@@ -130,7 +131,7 @@ exports.minify = function(files, options) {
     toplevel.print(stream);
 
     if(options.outSourceMap){
-        stream += "\n//# sourceMappingURL=" + options.outSourceMap;
+        stream += "\n//# sourceMappingURL=" + (options.sourceMapURL || options.outSourceMap);
     }
 
     var source_map = output.source_map;