Document that the DOCKER_BUILDKIT=1 flag is needed to build the doc…

…ker image. (#13515)
matrix-org · Aug 12, 2022 · 2c5e2ae · 2c5e2ae
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diff --git a/changelog.d/13515.doc b/changelog.d/13515.doc
@@ -0,0 +1 @@
+Document that the `DOCKER_BUILDKIT=1` flag is needed to build the docker image.
diff --git a/docker/README.md b/docker/README.md
@@ -191,7 +191,7 @@ If you need to build the image from a Synapse checkout, use the following `docke
  build` command from the repo's root:
 
 ```
-docker build -t matrixdotorg/synapse -f docker/Dockerfile .
+DOCKER_BUILDKIT=1 docker build -t matrixdotorg/synapse -f docker/Dockerfile .
 ```
 
 You can choose to build a different docker image by changing the value of the `-f` flag to