diff --git a/.gitignore b/.gitignore
index 4a5a717..01be4ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,4 +9,4 @@ jpeginfo.prn
 jpeginfo.ps
 jpeginfo.txt
 *.o
-*.jpg
+.DS_Store
diff --git a/test/README b/test/README
new file mode 100644
index 0000000..39afb74
--- /dev/null
+++ b/test/README
@@ -0,0 +1,14 @@
+Test images for jpegoptim.
+
+Copyright 2023 by Timo Kokkonen.
+These images are licensed under CC BY-NC-SA 4.0.
+
+To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/
+
+
+jpeginfo_test1.jpg: Test image created with Photoshop using generative AI.
+jpeginfo_test2.jpg: Test image resized and optimized.
+jpeginfo_test3.jpg: Test image resized and converted to grayscale.
+
+
+
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