diff --git a/landsat/combine.py b/landsat/combine.py
index 0102c92..441329d 100644
--- a/landsat/combine.py
+++ b/landsat/combine.py
@@ -15,5 +15,5 @@
 meta.update(count = 3, driver='PNG')
 with rasterio.open("output/result-%s.png" % source, 'w+', **meta) as output:
     for i in range(1, 4):
-        print(i)
+        print(source, i)
         output.write_band(i,rasterio.open("data/%s/%s_B%d.TIF" % (source, source, i+3)).read(1))