diff --git a/ChangeLog b/ChangeLog
index 6f1df29b..6dd51ee3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 1999-12-05  Martin Baulig  <martin@home-of-linux.org>
 
+	* include/glibtop/limits.h (GLIBTOP_INTERFACE_LEN): New #define.
+	(GLIBTOP_UNLIMITED): #define this to be `(~(u_int64_t)0)'.
+
 	* glibtop.h (glibtop): Added `refcount' field.
 	* lib/init.c (glibtop_server_ref, glibtop_server_unref): New
 	functions to deal with refcounts.
diff --git a/include/glibtop/limits.h b/include/glibtop/limits.h
index 7ff05d0f..01f1e176 100644
--- a/include/glibtop/limits.h
+++ b/include/glibtop/limits.h
@@ -39,6 +39,12 @@ BEGIN_LIBGTOP_DECLS
 /* Maximum length of a mountpoint/device name in glibtop_mountlist. */
 #define GLIBTOP_MOUNTENTRY_LEN	79
 
+/* Maximum length of a network interface name. */
+#define GLIBTOP_INTERFACE_LEN	32
+
+/* This is ((u_int64_t)-1) */
+#define GLIBTOP_UNLIMITED	(~(u_int64_t)0)
+
 END_LIBGTOP_DECLS
 
 #endif