diff --git a/sections/docker/install-for-production.md b/sections/docker/install-for-production.md
index 6e33a4d4..a597e5e4 100644
--- a/sections/docker/install-for-production.md
+++ b/sections/docker/install-for-production.md
@@ -38,6 +38,7 @@ RUN npm ci --production && npm clean cache --force
 FROM node:12-slim AS build
 WORKDIR /usr/src/app
 COPY package.json package-lock.json ./
+# Two mistakes below: Installing dev dependencies, not deleting the cache after npm install
 RUN npm install
 
 # The rest comes here