1 files changed, 1 insertions, 0 deletions
diff --git a/lib.h b/lib.h
index 81fea9b8..27b5c544 100644
--- a/lib.h
+++ b/lib.h
@@ -544,6 +544,7 @@ val atang(val);
 val atang2(val, val);
 val loga(val);
 val logten(val num);
+val logtwo(val num);
 val expo(val);
 val logand(val, val);
 val logior(val, val);