diff --git a/include/polarssl/x509.h b/include/polarssl/x509.h
index cd0dc84..385c8b5 100644
--- a/include/polarssl/x509.h
+++ b/include/polarssl/x509.h
@@ -300,6 +300,7 @@
     x509_buf issuer_id;         /**< Optional X.509 v2/v3 issuer unique identifier. */
     x509_buf subject_id;        /**< Optional X.509 v2/v3 subject unique identifier. */
     x509_buf v3_ext;            /**< Optional X.509 v3 extensions. Only Basic Contraints are supported at this time. */
+    x509_sequence subject_alt_names;    /**< Optional list of Subject Alternative Names (Only dNSName supported). */
 
     int ext_types;              /**< Bit string containing detected and parsed extensions */
     int ca_istrue;              /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */