diff --git a/CHANGES b/CHANGES
index 863d9ffd5..07310cdb2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -48,6 +48,7 @@ DayOfTheWeek, Month DD, YYYY / The Tcpdump Group
       Include <time.h> from netdissect.h.
       Remove init_crc10_table() and the entourage.
     Building and testing:
+      Add a configure option to help debugging (--enable-instrument-functions)
       At build time require a proof of suitable snprintf(3) implementation in
         libc (and document Solaris 9 as unsupported because of that).
       Makefile.in: Add two "touch .devel" commands in the releasecheck target.