diff --git a/docs/generate-test-data.py b/docs/generate-test-data.py
index 0051d24..4320255 100644
--- a/docs/generate-test-data.py
+++ b/docs/generate-test-data.py
@@ -1,5 +1,5 @@
 from random import random
-with open("sample-lat-lon.csv", "w") as f:
+with open("00-sample-latlon.csv", "w") as f:
     f.write("lat,lon\n")
 
     # Edge cases
diff --git a/test-data/sample-lat-lon.csv b/test-data/00-sample-latlon.csv
similarity index 100%
rename from test-data/sample-lat-lon.csv
rename to test-data/00-sample-latlon.csv
diff --git a/test-data/lat-lon-s2cpp-cellid.csv b/test-data/01-sample-latlon-s2cpp-cellid.csv
similarity index 100%
rename from test-data/lat-lon-s2cpp-cellid.csv
rename to test-data/01-sample-latlon-s2cpp-cellid.csv