Update README.md

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diff --git a/README.md b/README.md
index 980f2c3f6a..3b8e43266e 100644
--- a/README.md
+++ b/README.md
@@ -55,9 +55,11 @@ Please visit https://www.google.com/recaptcha/intro/ and generate keys.
 Ensure that the working directory is the repository root directory.
 
 To create misskey image:
+
 `sudo docker build -t misskey ./docker`
 
 To run misskey:
+
 `sudo docker run --rm -i -t -p $PORT:80 -v $(pwd):/root/misskey -v $DBPATH:/data/db misskey`
 
 where $PORT is the port used to access Misskey Web from host browser
@@ -65,6 +67,10 @@ and $DBPATH is the path of MongoDB database on the host for data persistence.
 
 ex: `sudo docker run --rm -i -t -p 80:80 -v $(pwd):/root/misskey -v /data/db:/data/db misskey`
 
+If you want to run misskey in production mode, add `--env NODE_ENV=production` like this:
+
+`sudo docker run --rm -i -t -p 80:80 -p 27017:27017 -v $(pwd):/root/misskey -v /data/db:/data/db --env NODE_ENV=production misskey`
+
 Note that $(pwd) is the working directory.
 
 ## Launch