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-rw-r--r--docker/complement/Dockerfile1
1 files changed, 1 insertions, 0 deletions
diff --git a/docker/complement/Dockerfile b/docker/complement/Dockerfile
index c5e7984a28..3cfff19f9a 100644
--- a/docker/complement/Dockerfile
+++ b/docker/complement/Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 # This dockerfile builds on top of 'docker/Dockerfile-workers' in matrix-org/synapse
 # by including a built-in postgres instance, as well as setting up the homeserver so
 # that it is ready for testing via Complement.