add logarithm functions to man page

1 files changed, 12 insertions, 0 deletions

diff --git a/doc/func.1 b/doc/func.1
index 0ae5bc2..98c5582 100644
--- a/doc/func.1
+++ b/doc/func.1
@@ -39,3 +39,15 @@ Factorial (!) function.
 .TP
 .B ch
 Combination function. n choose k with integers n and k such that n >= k >= 0.
+.
+.TP
+.B log10
+Decimal (base-10) logarithm function.
+.
+.TP
+.B log2
+Binary (base-2) logarithm function.
+.
+.TP
+.B ln
+Natural (base-e) logarithm function.