diff --git a/docs/deployment/docker.md b/docs/deployment/docker.md
index 1221ac1f87..e542b02ebf 100644
--- a/docs/deployment/docker.md
+++ b/docs/deployment/docker.md
@@ -59,7 +59,7 @@ Once the host build is complete, we are ready to build our image. The following
 FROM node:14-buster-slim
 
 WORKDIR /app
-
+# Copy repo skeleton first, to avoid unnecessary docker cache invalidation.
 # The skeleton contains the package.json of each package in the monorepo,
 # and along with yarn.lock and the root package.json, that's enough to run yarn install.
 COPY yarn.lock package.json packages/backend/dist/skeleton.tar.gz ./