diff --git a/.gitignore b/.gitignore
index 4b90f27..487ed33 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
-/data/light-meter-1/
-/data/light-meter-2/
+# All the data for this project is stored in data/ and can clog-up the
+# repositories commit history. All data apart from 'lm$-exhition-all.csv should
+# not be commited to the repository.
+/data/light-meter-*