BN_sub: document that r might be the same as a or b

[oweals/openssl.git] / doc / crypto / BN_add.pod

diff --git a/doc/crypto/BN_add.pod b/doc/crypto/BN_add.pod
index 38eeb3cd68cee7e2647b9f8ef373f7bfbf92a9a6..3ad227458da89a5dae7d1d84bbe38be92297909f 100644 (file)
--- a/doc/crypto/BN_add.pod
+++ b/doc/crypto/BN_add.pod
@@ -49,6 +49,7 @@ BN_add() adds I<a> and I<b> and places the result in I<r> (C<r=a+b>).
 I<r> may be the same B<BIGNUM> as I<a> or I<b>.
 
 BN_sub() subtracts I<b> from I<a> and places the result in I<r> (C<r=a-b>).
+I<r> may be the same B<BIGNUM> as I<a> or I<b>.
 
 BN_mul() multiplies I<a> and I<b> and places the result in I<r> (C<r=a*b>).
 I<r> may be the same B<BIGNUM> as I<a> or I<b>.
@@ -114,13 +115,4 @@ The error codes can be obtained by L<ERR_get_error(3)>.
 L<bn(3)>, L<ERR_get_error(3)>, L<BN_CTX_new(3)>,
 L<BN_add_word(3)>, L<BN_set_bit(3)>
 
-=head1 HISTORY
-
-BN_add(), BN_sub(), BN_sqr(), BN_div(), BN_mod(), BN_mod_mul(),
-BN_mod_exp() and BN_gcd() are available in all versions of SSLeay and
-OpenSSL. The I<ctx> argument to BN_mul() was added in SSLeay
-0.9.1b. BN_exp() appeared in SSLeay 0.9.0.
-BN_nnmod(), BN_mod_add(), BN_mod_sub(), and BN_mod_sqr() were added in
-OpenSSL 0.9.7.
-
 =cut