diff --git a/src/mconn-crypt.c b/src/mconn-crypt.c
index 7a691c6..fdf63d5 100644
--- a/src/mconn-crypt.c
+++ b/src/mconn-crypt.c
@@ -22,6 +22,20 @@
 #include <openssl/pem.h>
 #include "mconn-crypt.h"
 
+typedef struct _MConnCryptPrivate      MConnCryptPrivate;
+
+/**
+ * MConnCrypt:
+ *
+ * A simple wrapper for cypto operations.
+ **/
+
+struct _MConnCrypt
+{
+    GObject parent;
+    MConnCryptPrivate *priv;
+};
+
 struct _MConnCryptPrivate
 {
     RSA   *key;                 /* RSA key wrapper */
@@ -87,6 +101,12 @@ MConnCrypt *mconn_crypt_new_for_key_path(const char *path)
     return self;
 }
 
+MConnCrypt * mconn_crypt_ref(MConnCrypt *self)
+{
+    g_assert(IS_MCONN_CRYPT(self));
+    return MCONN_CRYPT(g_object_ref(self));
+}
+
 void mconn_crypt_unref(MConnCrypt *self)
 {
     if (self != NULL)
diff --git a/src/mconn-crypt.h b/src/mconn-crypt.h
index dd84f8b..a131521 100644
--- a/src/mconn-crypt.h
+++ b/src/mconn-crypt.h
@@ -1,6 +1,6 @@
 /* ex:ts=4:sw=4:sts=4:et */
 /* -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
-/**
+/*
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
@@ -14,14 +14,13 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
- * AUTHORS
- * Maciek Borzecki <maciek.borzecki (at] gmail.com>
+ * Author: Maciek Borzecki <maciek.borzecki (at] gmail.com>
  */
 #ifndef __MCONN_CRYPT_H__
 #define __MCONN_CRYPT_H__
 
 #include <glib-object.h>
-
+#include <glib.h>
 
 G_BEGIN_DECLS
 
@@ -48,25 +47,54 @@ G_BEGIN_DECLS
 
 typedef struct _MConnCrypt      MConnCrypt;
 typedef struct _MConnCryptClass MConnCryptClass;
-typedef struct _MConnCryptPrivate      MConnCryptPrivate;
-
 struct _MConnCryptClass
 {
     GObjectClass parent_class;
 };
 
-struct _MConnCrypt
-{
-    GObject parent;
-    MConnCryptPrivate *priv;
-};
-
 GType mconn_crypt_get_type (void) G_GNUC_CONST;
 
+/**
+ * mconn_crypt_new_for_key_path:
+ * @path: key path
+ *
+ * Returns: (transfer full) (element-type MConnCrypt): new object
+ */
 MConnCrypt *mconn_crypt_new_for_key_path(const char *path);
+
+/**
+ * mconn_crypt_unref:
+ * @crypt: crypt object
+ */
+void mconn_crypt_unref(MConnCrypt *crypt);
+
+/**
+ * mconn_crypt_ref:
+ * @crypt: crypt object
+ *
+ * Take reference to crypt object
+ * Returns: (transfer none): reffed object
+ */
 void mconn_crypt_unref(MConnCrypt *crypt);
-GBytes * mconn_crypt_decrypt(MConnCrypt *crypt, GBytes *data, GError **err);
+
+/**
+ * mconn_crypt_decrypt:
+ * @crypt: crypt object
+ * @data: (type GBytes): data
+ * @error: return location for a GError or NULL
+ *
+ * Returns: (transfer full): a new #GBytes with decoded data
+ */
+GBytes * mconn_crypt_decrypt(MConnCrypt *crypt, GBytes *data, GError **error);
+
+/**
+ * mconn_crypt_get_public_key_pem:
+ * @crypt: crypt object
+ *
+ * Returns: (transfer full): allocated string with public key in PEM format
+ */
 gchar * mconn_crypt_get_public_key_pem(MConnCrypt *crypt);
+
 G_END_DECLS
 
 #endif /* __MCONN_CRYPT_H__ */