Now that one is a bit more funky, but it can documented correctly.

Index: port-modules.5
===================================================================
RCS file: /build/data/openbsd/cvs/src/share/man/man5/port-modules.5,v
diff -u -p -r1.284 port-modules.5
--- port-modules.5	22 Jun 2026 10:36:51 -0000	1.284
+++ port-modules.5	22 Jun 2026 16:30:09 -0000
@@ -422,7 +422,7 @@ and
 .Ev CATEGORIES .
 .Pp
 Some CPAN modules are only indexed by author, set
-.Li CPAN_AUTHOR=ID
+.Li Ev CPAN_AUTHOR Ns = Ns Ar ID
 to locate the right directory.
 .Pp
 If no