diff --git a/SUMMARY.md b/SUMMARY.md
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+++ b/SUMMARY.md
@@ -2,4 +2,5 @@
 
 * [Introduction](README.md)
 * [First Page](first-page.md)
+* [Test images](test-images.md)
 
diff --git a/assets/magnetic-field-along-galactic-plane-1920.jpg b/assets/magnetic-field-along-galactic-plane-1920.jpg
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+# Test image
+
+![](/assets/magnetic-field-along-galactic-plane-1920.jpg)
+