diff --git a/doc/man3/d2i_PrivateKey.pod b/doc/man3/d2i_PrivateKey.pod
index eb34a1386f..aac92336c3 100644
--- a/doc/man3/d2i_PrivateKey.pod
+++ b/doc/man3/d2i_PrivateKey.pod
@@ -86,6 +86,10 @@ functions described in L<d2i_X509(3)>.
 
 =head1 NOTES
 
+All the functions that operate on data in memory update the data pointer I<*pp>
+after a successful operation, just like the other d2i and i2d functions;
+see L<d2i_X509(3)>.
+
 All these functions use DER format and unencrypted keys. Applications wishing
 to encrypt or decrypt private keys should use other functions such as
 d2i_PKCS8PrivateKey() instead.
diff --git a/doc/man3/d2i_RSAPrivateKey.pod b/doc/man3/d2i_RSAPrivateKey.pod
index 3e991a0c9f..20cdfb1fcb 100644
--- a/doc/man3/d2i_RSAPrivateKey.pod
+++ b/doc/man3/d2i_RSAPrivateKey.pod
@@ -265,8 +265,8 @@ Functions such as strlen() will B<not> return the correct length
 of the encoded structure.
 
 The ways that I<*ppin> and I<*ppout> are incremented after the operation
-can trap the unwary. See the B<WARNINGS> section for some common
-errors.
+can trap the unwary. See the B<WARNINGS> section in L<d2i_X509(3)> for some
+common errors.
 The reason for this-auto increment behaviour is to reflect a typical
 usage of ASN1 functions: after one structure is encoded or decoded
 another will be processed after it.