diff --git a/update.sh b/update.sh
index 565b78c..ae63ccc 100755
--- a/update.sh
+++ b/update.sh
@@ -50,12 +50,20 @@ echo "## Notes
 - These files are [gortr][3] compatible:
   - [export_dn42.json](export_dn42.json)
 
-## [Last commit][0] at [dn42 registry][1]
+## [Last merge commit][0] at [dn42 registry][1]
 
 \`\`\`
 $(git -C ../registry/ log -n 1 --merges)
 \`\`\`
 
+## crontab
+
+You can setup a cronjob to check in with updates to the ROA files listed
+above on regular intervals.
+
+Currently the ROA files published here is refreshed every 3rd hour if
+updates has been made to the [DN42 registry[1].
+
 ## Misc statistics
 
 - ROAs IPv4:  $(cat roa/bird4_route_dn42.conf | grep -v '^#' | grep -v '^$' | wc -l)