diff --git a/src/core/math.c b/src/core/math.c
index 5cd66f68..d6e05a94 100644
--- a/src/core/math.c
+++ b/src/core/math.c
@@ -149,7 +149,7 @@ static const JanetReg math_cfuns[] = {
     {
         "math/log", janet_log,
         JDOC("(math/log x)\n\n"
-             "Returns log base 2 of x.")
+             "Returns log base natural number of x.")
     },
     {
         "math/log10", janet_log10,