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-rw-r--r--doc/crypto/BN_rand.pod6
1 files changed, 5 insertions, 1 deletions
diff --git a/doc/crypto/BN_rand.pod b/doc/crypto/BN_rand.pod
index e8cbf658b47d..a1513a952654 100644
--- a/doc/crypto/BN_rand.pod
+++ b/doc/crypto/BN_rand.pod
@@ -19,7 +19,11 @@ BN_rand, BN_pseudo_rand, BN_rand_range, BN_pseudo_rand_range - generate pseudo-r
=head1 DESCRIPTION
BN_rand() generates a cryptographically strong pseudo-random number of
-B<bits> in length and stores it in B<rnd>. If B<top> is -1, the
+B<bits> in length and stores it in B<rnd>.
+If B<bits> is less than zero, or too small to
+accomodate the requirements specified by the B<top> and B<bottom>
+parameters, an error is returned.
+If B<top> is -1, the
most significant bit of the random number can be zero. If B<top> is 0,
it is set to 1, and if B<top> is 1, the two most significant bits of
the number will be set to 1, so that the product of two such random