diff --git a/tools/create_container b/tools/create_container
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+#!/bin/sh
+# Start a Linux container containing the mu/ directory.
+# Useful on non-Linux platforms.
+# Run it from the top-level mu/ directory.
+
+docker run -it --name mu -v `pwd`:/mu abyssos/abyss:dev
+
+# On the first startup, you'll need to run the following commands:
+#   apk add git nano libcxx-dev
+#   cd /mu
+
+# Leaving this container will stop it.
+# Restart it with:
+#   docker start mu
+#
+# Now you can connect to it anytime with:
+#   docker exec -it mu sh
+#   cd /mu
+#
+# Quite slow, though. Docker has to run a VM on other platforms.