diff --git a/update.sh b/update.sh
index 5256e67..6fb591e 100755
--- a/update.sh
+++ b/update.sh
@@ -58,7 +58,7 @@ $(git -C ../registry/ log -n 1 --merges)
 
 ## crontab
 
-You can setup a cronjob to check in with updates to the ROA files listed
+You can setup a [cronjob][5] to check in with updates to the ROA files listed
 above on regular intervals.
 
 Currently the ROA files published here is refreshed every 6th hour if
@@ -75,6 +75,7 @@ updates has been made to the [DN42 registry][1].
 [2]: https://github.com/NLnetLabs/routinator
 [3]: https://github.com/cloudflare/gortr
 [4]: https://tools.ietf.org/html/rfc8416
+[5]: doc/crontab.md
 " > roa/README.md
 
 # Commit latest version of ROA files