diff --git a/tools/pdfdiff.py b/tools/pdfdiff.py
index 8723027..68478fb 100644
--- a/tools/pdfdiff.py
+++ b/tools/pdfdiff.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 
 """
-compares rwo pdf files.
+compares two pdf files.
 """
 import io
 import logging