diff --git a/configure.ac b/configure.ac
index 623f9833ff84f04ab807b21750bbd532d7323403..ad61642415129c11e79f07566f1650cfaa909765 100644
--- a/configure.ac
+++ b/configure.ac
@@ -527,6 +527,7 @@ fi
 
 dnl
 dnl Buggy glibc prevention. Purposedly not cached.
+dnl See sourceware.org bugs 5058 and 5443.
 dnl Ubuntu alone has 20 bug numbers for this...
 dnl
 AC_MSG_CHECKING(for buggy GNU/libc versions)