diff --git a/setup.py b/setup.py
index b6d0eaf..0543f6e 100755
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@ except ImportError:
 version_info = sys.version_info[:2]
 source_folder = "py" + str(version_info[0]) + str(version_info[1])
 if not os.path.exists(source_folder):
-    raise EnvironmentError("unsupported version of Python")
+    raise EnvironmentError("unsupported version of Python, looking for " + repr(source_folder))
 
 requirements = [
     # no external requirements