diff --git a/layers.d/README.adoc b/layers.d/README.adoc
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@@ -0,0 +1,8 @@
+= layers.d
+
+
+This directory contains override layers for images provided by the upstream
+repository. Each set of layers is in a directory denoted by the
+`organization`/`image-name`/`tag-name`. Within each directory, layers must be
+`.tar.gz` files and will be applied in file system sort-order, so it is
+recommended to prefix each layer's filename with a number.
diff --git a/layers.d/library/alpine/latest/1-readme.tar.gz b/layers.d/library/alpine/latest/1-readme.tar.gz
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