diff --git a/extra/etc/check-containers b/extra/etc/check-containers
index 59cf661..457c582 100644
--- a/extra/etc/check-containers
+++ b/extra/etc/check-containers
@@ -1,6 +1,13 @@
 #!/usr/bin/env bash
 # check-containers
 #
+# save to
+# /usr/local/bin/check-containers
+#
+# bash/zsh
+# alias containers='CHECK_CONTAINERS_QUIET=1 CHECK_CONTAINERS_IGNORE_ERRORS=1 bash /usr/local/bin/check-containers'
+# alias containers-watch='CHECK_CONTAINERS_QUIET=1 CHECK_CONTAINERS_IGNORE_ERRORS=1 bash /usr/local/bin/check-containers monitor'
+#
 # statuses:
 #   online   = http response exactly 200
 #   error    = reachable but non-200 response
@@ -12,6 +19,9 @@
 #   1 = at least one error
 #   2 = at least one offline
 #   3 = runtime/config/dependency error
+#
+# ================================================================================
+
 
 set -u
 set -o pipefail