Minor comment improvement.

diff --git a/testing/aptmark/user b/testing/aptmark/user
index 6d421f41d68752dc19e6374aba64dfe0554aca43..fed4d1839723dc50dfa01abc5b2b7a435068cac7 100644 (file)
--- a/testing/aptmark/user
+++ b/testing/aptmark/user
@@ -1,6 +1,6 @@
 # for secrets
 pmount
-# ping won't work for user without this
+# ping won't work for user without this – see <https://shallowsky.com/blog/linux/ping-permissions.html>
 linux-sysctl-defaults
 # generally useful
 ack