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-rw-r--r--dev/ci/docker/bionic_coq/Dockerfile3
1 files changed, 3 insertions, 0 deletions
diff --git a/dev/ci/docker/bionic_coq/Dockerfile b/dev/ci/docker/bionic_coq/Dockerfile
index 689d203a1..a1178ee2a 100644
--- a/dev/ci/docker/bionic_coq/Dockerfile
+++ b/dev/ci/docker/bionic_coq/Dockerfile
@@ -1,3 +1,6 @@
+# CACHEKEY: "bionic_coq-V2018-05-07-V2"
+# ^^ Update when modifying this file.
+
FROM ubuntu:bionic
LABEL maintainer="e@x80.org"