diff --git a/README.md b/README.md
index ad04406..90cf0ca 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,5 @@ If you are looking for downloads go here: http://addons.getnightingale.com/
 
 You can use the script make.py to generate xpi files like this:
 ```shell
-python make.py <add-on_folder>
-````
-
-(add-on_folder without trailing slash)
+./make.py <add-on_folder>
+```
diff --git a/make.py b/make.py
index ee2a349..2d8160d 100755
--- a/make.py
+++ b/make.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 import os
 import sys
 from zipfile import ZipFile
@@ -9,7 +11,7 @@
   install = parse(os.path.join(sys.argv[1], "install.rdf"))
   element = install.getElementsByTagName("em:version")[0]
   version = element.firstChild.data
-  xpiName = sys.argv[1] + "-" + version + ".xpi"
+  xpiName = sys.argv[1].rstrip("/") + "-" + version + ".xpi"
   xpi = ZipFile(xpiName, "w")
   os.chdir(sys.argv[1])
   for root, dirs, files in os.walk("."):
@@ -18,7 +20,7 @@
           xpi.write(path, path, 8)
   xpi.close()
   os.chdir("..")
-  if os.path.exists(xpiName):
+  if os.path.exists(os.path.basename(xpiName)):
       print(xpiName + " successfully written.")
   else:
       sys.exit(xpiName + " could not be written.")