diff --git a/.devcontainer/README.md b/.devcontainer/README.md
new file mode 100644
index 0000000..2155b5a
--- /dev/null
+++ b/.devcontainer/README.md
@@ -0,0 +1,3 @@
+# Optional Docker Environment
+
+This is an optional Docker environment for those users who prefer Docker. For more instructions, see the *Docker Environment Setup Guide* in [../appendix-A/04_optional-docker-environment](../appendix-A/04_optional-docker-environment).
\ No newline at end of file