diff --git a/package/binutils/Config.in.host b/package/binutils/Config.in.host
index a7610b447c..dce699621d 100644
--- a/package/binutils/Config.in.host
+++ b/package/binutils/Config.in.host
@@ -18,6 +18,7 @@ choice
 	config BR2_BINUTILS_VERSION_2_27_X
 		bool "binutils 2.27"
 		# supported but broken on Microblaze
+		# see https://sourceware.org/bugzilla/show_bug.cgi?id=20748
 		depends on !BR2_microblaze
 
 endchoice