1 files changed, 1 insertions, 0 deletions
diff --git a/lib.h b/lib.h
index f4558bf2..d5158b64 100644
--- a/lib.h
+++ b/lib.h
@@ -479,6 +479,7 @@ val tang(val);
 val asine(val);
 val acosi(val);
 val atang(val);
+val atang2(val, val);
 val loga(val);
 val expo(val);
 val logand(val, val);