commit b962b25ecaf6ddb11a36235d4a9849a147b4f6a3
from: Russ Cox <rsc@swtch.com>
date: Tue May 05 12:35:56 2020 UTC

rc(1): mention /etc/shells in BUGS section

commit - 601e07b63653d0fed91594ebba261b733d017653
commit + b962b25ecaf6ddb11a36235d4a9849a147b4f6a3
blob - add334fab088c253719485fb9f949d7d43b0ac52
blob + 792cdc95b48d443be2e5abcb8f8570882936824b
--- man/man1/rc.1
+++ man/man1/rc.1
@@ -989,3 +989,9 @@ and then
 .B fstab
 ensures causes FreeBSD to mount the file system
 automatically at boot time.)
+.PP
+Some systems require
+.B \*9/bin/rc
+to be listed in
+.B /etc/shells
+before it can be used as a login shell.