cp: -r and -R imply -d (coreutils compat)

diff --git a/coreutils/cp.c b/coreutils/cp.c
index 889e460..046067f 100644
--- a/coreutils/cp.c
+++ b/coreutils/cp.c
@@ -44,8 +44,9 @@
 	// Soft- and hardlinking don't mix
 	// -P and -d are the same (-P is POSIX, -d is GNU)
 	// -r and -R are the same
+	// -R (and therefore -r) switches on -d (coreutils does this)
 	// -a = -pdR
-	opt_complementary = "-2:l--s:s--l:Pd:rR:apdR";
+	opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:apdR";
 	flags = getopt32(argv, FILEUTILS_CP_OPTSTR "arPHL");
 	argc -= optind;
 	argv += optind;