diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6c26341e866d396d3dd9752b24281c820b4d0054..2cd43b62c481b956d0ec0507604685eb40d1645f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -21,7 +21,7 @@ variables:
   - 'cat build-log.txt | egrep "[a-zA-Z0-9_/-]+ \((real|user): [0-9]" | tee build-time.txt'
   - 'if test -n "$VALIDATE" && (( RANDOM % 10 == 0 )); then make validate; fi'
   cache:
-    key: "coq$COQ_VERSION-ssr$SSR_VERSION"
+    key: "coq.$COQ_VERSION-ssr.$SSR_VERSION"
     paths:
     - opamroot/
   only:
diff --git a/Makefile b/Makefile
index 3644fec8947d1b2824d571b6a048d8f66813019e..97b9487b5abf7b457a922f469bc8a36ca0038c3c 100644
--- a/Makefile
+++ b/Makefile
@@ -26,8 +26,8 @@ build-dep: phony
 	mkdir -p build-dep
 	@sed <opam 's/^\(build\|install\|remove\):.*/\1: []/; s/^name: *"\(.*\)" */name: "\1-builddep"/' > build-dep/opam
 	@fgrep builddep build-dep/opam >/dev/null || (echo "sed failed to fix the package name" && exit 1) # sanity check
-	@# Compute the package name, add the pin and (re)install it.  Reinstallation is needed
-	@# in case the pin already exists, but the builddep package changed.
+	# Compute the package name, add the pin and (re)install it.
+	@# Reinstallation is needed in case the pin already exists, but the builddep package changed.
 	@BUILD_DEP_PACKAGE="$$(egrep "^name:" build-dep/opam | sed 's/^name: *"\(.*\)" */\1/')"; \
 	  opam pin add "$$BUILD_DEP_PACKAGE" "$$(pwd)/build-dep" -k path $(OPAMFLAGS) && \
 	  opam reinstall "$$BUILD_DEP_PACKAGE"
diff --git a/build/opam-ci.sh b/build/opam-ci.sh
index 73f621291e3e737708e3030bca40db4c88da1661..94c738e52845312a7f8c45660917b4ad87c97fd7 100755
--- a/build/opam-ci.sh
+++ b/build/opam-ci.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 set -e
-# This script installs the build dependencies for CI builds.
+## This script installs the build dependencies for CI builds.
 
 # Prepare OPAM configuration
 export OPAMROOT="$(pwd)/opamroot"
@@ -44,10 +44,12 @@ while (( "$#" )); do # while there are arguments left
 done
 
 # Upgrade cached things.
+echo "[opam-ci] Upgrading opam"
 opam upgrade -y
 
 # Install build-dependencies.
 echo
+echo "[opam-ci] Installing build-dependencies"
 make build-dep OPAMFLAGS=-y
 
 # done