diff --git a/lib/libc/gen/err.3 b/lib/libc/gen/err.3
index 753ef15fc91..1e2d7c3d559 100644
--- a/lib/libc/gen/err.3
+++ b/lib/libc/gen/err.3
@@ -158,6 +158,10 @@ and
 .Fn verrx
 functions do not return, but exit with the value of the argument
 .Fa eval .
+It is recommended that the standard values defined in
+.Xr sysexits 3
+be used for the value of
+.Fa eval .
 The
 .Fn err_set_exit
 function can be used to specify a function which is called before
@@ -209,7 +213,8 @@ if (error != 0)
 .Xr exit 3 ,
 .Xr fmtmsg 3 ,
 .Xr printf 3 ,
-.Xr strerror 3
+.Xr strerror 3 ,
+.Xr sysexits 3
 .Sh HISTORY
 The
 .Fn err
diff --git a/share/man/man3/sysexits.3 b/share/man/man3/sysexits.3
index b1ba47aa0b2..044d61e91d1 100644
--- a/share/man/man3/sysexits.3
+++ b/share/man/man3/sysexits.3
@@ -127,6 +127,7 @@ Something was found in an unconfigured or misconfigured state.
 The numerical values corresponding to the symbolical ones are given in
 parenthesis for easy reference.
 .Sh SEE ALSO
+.Xr err 3 ,
 .Xr exit 3 ,
 .Xr style 9
 .Sh HISTORY