diff --git a/debian/rules b/debian/rules
index 2fac33f2..3428d220 100755
--- a/debian/rules
+++ b/debian/rules
@@ -489,6 +489,7 @@ ifeq (${LIBFUZZER_ENABLE},yes)
 endif
 	touch $@
 
+# Libc++ doesn't build with:
 # Fails with    $<TARGET_LINKER_FILE:unwind_static>
 #  No target "unwind_static"
 # on 12. Will test with 13