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-rw-r--r--src/tipwin.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/tipwin.cc b/src/tipwin.cc
index 1b6d91a2..d71f2a4e 100644
--- a/src/tipwin.cc
+++ b/src/tipwin.cc
@@ -1,3 +1,7 @@
+// tipwin.cc is derived from "Fl_Slider with a floating tooltip to show
+// current value" at http://seriss.com/people/erco/fltk/#SliderTooltip by
+// Greg Ercolano.
+
#include <stdio.h>
#include <stdlib.h>
#include <string.h>