--- src/cf.data.pre.orig	2020-04-19 10:50:48 UTC
+++ src/cf.data.pre
@@ -5322,6 +5322,10 @@ DEFAULT: @DEFAULT_PID_FILE@
 LOC: Config.pidFilename
 DOC_START
 	A filename to write the process-id to.  To disable, enter "none".
+
+	Note: If you change this setting, you need to set squid_pidfile
+	in /etc/rc.conf to reflect the new value. Please see
+	/usr/local/etc/rc.d/squid for details.
 DOC_END
 
 NAME: client_netmask