diff --git a/configure.ac b/configure.ac
index 003d76989b9..c3111698f83 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,6 +31,7 @@ BITCOIN_MP_NODE_NAME=bitcoin-node
 BITCOIN_MP_GUI_NAME=bitcoin-gui
 
 dnl Unless the user specified ARFLAGS, force it to be cr
+dnl This is also the default as-of libtool 2.4.7
 AC_ARG_VAR([ARFLAGS], [Flags for the archiver, defaults to <cr> if not set])
 if test "${ARFLAGS+set}" != "set"; then
   ARFLAGS="cr"