diff --git a/.gitignore b/.gitignore
index 65c9d7f..d148090 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,6 @@ npm-debug.log*
 
 # jupyter
 notebooks/**/.ipynb_checkpoints/
-notebooks/_scratchpad.ipynb
+
+# data files
+*.hdf5