diff --git a/shared/README.md b/shared/README.md
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+# Shared directory
+
+Files here are accessible to Tailscale under the `/shared` directory in the Docker container. To make a directory accessible to the public internet, configure `config/tailscale-serve-config` with the desired path-to-directory mapping.
+
diff --git a/shared/data-structures-tutoring/README.md b/shared/data-structures-tutoring/README.md
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+Hello World!