diff --git a/README.md b/README.md
index 105941d..768566a 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ Include this in your gulp file:
 var opt = {
   // prefix domain in the `name` param when uploading a file. Leave blank to use the path
   // verbatim. Do not include a trailing slash.
+  // Also accepts callback function where filename is passed as single param, must return a string
   DOMAIN: '',
   API_URL: 'https://app.getsentry.com/api/0/projects/ORGANIZATION/PROJECT/',
   API_KEY: 'MY_LONG_API_KEY',
diff --git a/index.js b/index.js
index f109988..72f2e1f 100644
--- a/index.js
+++ b/index.js
@@ -88,7 +88,7 @@ module.exports = function (packageFile, opt) {
 							filename: file.relative
 						}
 					},
-					name: (opt.DOMAIN || '') + '/' + slash(file.relative)
+					name: opt.DOMAIN && opt.DOMAIN instanceof Function ? opt.DOMAIN(file.relative) : (opt.DOMAIN || '') + '/' + slash(file.relative)
 				}
 			}, cb);
 		}