diff --git a/systemd/conservancy-www-update.sh b/systemd/conservancy-www-update.sh
index 9f8db9eea1dcb02ce93ff24c2397a198d63c9a00..d059a8d281f55ea724adc68c59c95688e7f6822f 100755
--- a/systemd/conservancy-www-update.sh
+++ b/systemd/conservancy-www-update.sh
@@ -1,5 +1,10 @@
 #!/bin/sh
 
+# Pull in and apply Conservancy website updates from the git repository.
+#
+# This is intended to be run on a timer. Note that it does *not* restart the
+# Django application or run the migrate and collectstatic commands.
+
 set -e
 set -u
 set -x