diff --git a/bin/sassw b/bin/sassw
index e580f02..f936346 100755
--- a/bin/sassw
+++ b/bin/sassw
@@ -7,6 +7,7 @@
 # (output will automatically be INPUT with .scss changed to .css)
 
 import json
+import glob
 import os
 import pyinotify
 import subprocess
@@ -14,6 +15,11 @@ import sys
 import time
 
 filename = sys.argv[1]
+if os.path.isdir(filename):
+    scss_filenames = [x for x in os.listdir(filename) if x.startswith('_') and x.endswith('.scss')]
+    if not scss_filenames:
+        print('Error: directory specified but no proper scss file within.', file=sys.stderr)
+    filename = os.path.join(filename, scss_filenames[0])
 
 def build():
     global sources, directories