diff --git a/xenonpy/datatools/sparse_conversion.py b/xenonpy/datatools/sparse_conversion.py
new file mode 100644
index 00000000..f579dd19
--- /dev/null
+++ b/xenonpy/datatools/sparse_conversion.py
@@ -0,0 +1 @@
+# sparse conversion codes
\ No newline at end of file