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-rw-r--r--crypto/openssl/doc/crypto/BN_rand.pod3
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/openssl/doc/crypto/BN_rand.pod b/crypto/openssl/doc/crypto/BN_rand.pod
index 81f93c2eb3a4..3b2796c5df41 100644
--- a/crypto/openssl/doc/crypto/BN_rand.pod
+++ b/crypto/openssl/doc/crypto/BN_rand.pod
@@ -24,7 +24,8 @@ 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
numbers will always have 2*B<bits> length. If B<bottom> is true, the
-number will be odd.
+number will be odd. The value of B<bits> must be zero or greater. If B<bits> is
+1 then B<top> cannot also be 1.
BN_pseudo_rand() does the same, but pseudo-random numbers generated by
this function are not necessarily unpredictable. They can be used for