diff --git a/src/core/math.c b/src/core/math.c
index b1c3fda9..c2b575ef 100644
--- a/src/core/math.c
+++ b/src/core/math.c
@@ -413,7 +413,7 @@ static const JanetReg math_cfuns[] = {
         "math/rng", cfun_rng_make,
         JDOC("(math/rng &opt seed)\n\n"
              "Creates a Psuedo-Random number generator, with an optional seed. "
-             "The seed should be an unsigned 32 bit integer. "
+             "The seed should be an unsigned 32 bit integer or a buffer. "
              "Do not use this for cryptography. Returns a core/rng abstract type.")
     },
     {