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-rw-r--r--missing/isnan.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/missing/isnan.c b/missing/isnan.c
index 3c56765..df424c2 100644
--- a/missing/isnan.c
+++ b/missing/isnan.c
@@ -1,3 +1,5 @@
+/* public domain rewrite of isnan(3) */
+
#ifdef _MSC_VER
#include <float.h>