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diff --git a/openssl/doc/crypto/RSA_blinding_on.pod b/openssl/doc/crypto/RSA_blinding_on.pod
new file mode 100644
index 000000000..fd2c69abd
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+++ b/openssl/doc/crypto/RSA_blinding_on.pod
@@ -0,0 +1,43 @@
+=pod
+
+=head1 NAME
+
+RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
+
+=head1 SYNOPSIS
+
+ #include <openssl/rsa.h>
+
+ int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
+
+ void RSA_blinding_off(RSA *rsa);
+
+=head1 DESCRIPTION
+
+RSA is vulnerable to timing attacks. In a setup where attackers can
+measure the time of RSA decryption or signature operations, blinding
+must be used to protect the RSA operation from that attack.
+
+RSA_blinding_on() turns blinding on for key B<rsa> and generates a
+random blinding factor. B<ctx> is B<NULL> or a pre-allocated and
+initialized B<BN_CTX>. The random number generator must be seeded
+prior to calling RSA_blinding_on().
+
+RSA_blinding_off() turns blinding off and frees the memory used for
+the blinding factor.
+
+=head1 RETURN VALUES
+
+RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
+
+RSA_blinding_off() returns no value.
+
+=head1 SEE ALSO
+
+L<rsa(3)|rsa(3)>, L<rand(3)|rand(3)>
+
+=head1 HISTORY
+
+RSA_blinding_on() and RSA_blinding_off() appeared in SSLeay 0.9.0.
+
+=cut