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-rw-r--r--doc/man3/BN_mod_inverse.pod6
1 files changed, 5 insertions, 1 deletions
diff --git a/doc/man3/BN_mod_inverse.pod b/doc/man3/BN_mod_inverse.pod
index 5dbb5c3cc2..f88e0e63fa 100644
--- a/doc/man3/BN_mod_inverse.pod
+++ b/doc/man3/BN_mod_inverse.pod
@@ -18,7 +18,11 @@ places the result in B<r> (C<(a*r)%n==1>). If B<r> is NULL,
a new B<BIGNUM> is created.
B<ctx> is a previously allocated B<BN_CTX> used for temporary
-variables. B<r> may be the same B<BIGNUM> as B<a> or B<n>.
+variables. B<r> may be the same B<BIGNUM> as B<a>.
+
+=head1 NOTES
+
+It is an error to use the same B<BIGNUM> as B<n>.
=head1 RETURN VALUES