diff --git a/debian/rules b/debian/rules
index 1d14f581..d69e3f49 100755
--- a/debian/rules
+++ b/debian/rules
@@ -228,6 +228,7 @@ ifeq (,$(filter $(DISTRO), $(THIN_UNSUPPORTED_DISTRO)))
 # Only enable it for archs supporting gold
 ifneq (,$(filter $(DEB_HOST_ARCH),$(BINUTILS_GOLD_ARCHS)))
 # armhf is not yet quite ready for Thin, it FTBFS
+# see https://buildd.debian.org/status/fetch.php?pkg=llvm-toolchain-8&arch=armhf&ver=1%3A8.0.1%7E%2Brc2-1%7Eexp1&stamp=1560334266&raw=0
 ifeq (,$(filter $(DEB_HOST_ARCH), armhf))
 	CMAKE_EXTRA += -DLLVM_ENABLE_LTO="Thin"
 endif