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-rw-r--r--gnu/system/examples/docker-image.tmpl1
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diff --git a/gnu/system/examples/docker-image.tmpl b/gnu/system/examples/docker-image.tmpl
index bdc6afa6f0..7123917af4 100644
--- a/gnu/system/examples/docker-image.tmpl
+++ b/gnu/system/examples/docker-image.tmpl
@@ -1,3 +1,4 @@
+;; -*- mode: scheme; -*-
 ;; This is an operating system configuration template for a "Docker image"
 ;; setup, so it has barely any services at all.