X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=doc%2Fcrypto%2Fcrypto.pod;h=7a527992bb5eb29eb9aa5aa39c2bae3ca242d87e;hp=c12eec1409c56c7aac25da6fd9321faf139295fc;hb=9034c56c6c71ac68f25f195300e3d7b129280824;hpb=5256b021f3f41396763cb4a93653460a396f393e

diff --git a/doc/crypto/crypto.pod b/doc/crypto/crypto.pod
index c12eec1409..7a527992bb 100644
--- a/doc/crypto/crypto.pod
+++ b/doc/crypto/crypto.pod
@@ -62,6 +62,22 @@ L<txt_db(3)|txt_db(3)>
 
 =back
 
+=head1 NOTES
+
+Some of the newer functions follow a naming convention using the numbers
+B<0> and B<1>. For example the functions:
+
+ int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);
+ int X509_add1_trust_object(X509 *x, ASN1_OBJECT *obj);
+
+The B<0> version uses the supplied structure pointer directly
+in the parent and it will be freed up when the parent is freed.
+In the above example B<crl> would be freed but B<rev> would not.
+
+The B<1> function uses a copy of the supplied structure pointer
+(or in some cases increases its link count) in the parent and
+so both (B<x> and B<obj> above) should be freed up.
+
 =head1 SEE ALSO
 
 L<openssl(1)|openssl(1)>, L<ssl(3)|ssl(3)>