1 files changed, 1 insertions, 0 deletions
diff --git a/lib.h b/lib.h
index e4dbfb8d..9876d77f 100644
--- a/lib.h
+++ b/lib.h
@@ -425,6 +425,7 @@ val expt(val base, val exp);
 val exptv(val nlist);
 val exptmod(val base, val exp, val mod);
 val sqroot(val anum);
+val isqrt(val anum);
 val gcd(val anum, val bnum);
 val floorf(val);
 val ceili(val);