1 files changed, 4 insertions, 0 deletions

diff --git a/dtoa.c b/dtoa.c
index 33fd6f0..19a0cae 100644
--- a/dtoa.c
+++ b/dtoa.c
@@ -1,3 +1,7 @@
+/* The code comes from https://portal.ampl.com/~dmg/netlib/fp/dtoa.c
+ * Go to https://portal.ampl.com/~dmg/netlib/fp/changes for the detailed changes.
+ */
+
 /****************************************************************
  *
  * The author of this software is David M. Gay.