diff --git a/ndn-cpp/c/transport/socket-transport.h b/ndn-cpp/c/transport/socket-transport.h
index 0011e26..6c2da6e 100644
--- a/ndn-cpp/c/transport/socket-transport.h
+++ b/ndn-cpp/c/transport/socket-transport.h
@@ -22,18 +22,59 @@
   int socketDescriptor; /**< -1 if not connected */
 };
   
+/**
+ * Initialize the ndn_SocketTransport struct with default values for no connection yet.
+ * @param self A pointer to the ndn_SocketTransport struct.
+ */
 static inline void ndn_SocketTransport_init(struct ndn_SocketTransport *self)
 {
   self->socketDescriptor = -1;
 }
 
+/**
+ * Connect with TCP or UDP to the host:port.
+ * @param self A pointer to the ndn_SocketTransport struct.
+ * @param socketType SOCKET_TCP or SOCKET_UDP.
+ * @param host The host to connect to.
+ * @param port The port to connect to.
+ * @return 0 for success, else an error code.
+ */
 ndn_Error ndn_SocketTransport_connect(struct ndn_SocketTransport *self, ndn_SocketType socketType, char *host, unsigned short port);
 
+/**
+ * Send data to the socket.
+ * @param self A pointer to the ndn_SocketTransport struct.
+ * @param data A pointer to the buffer of data to send.
+ * @param dataLength The number of bytes in data.
+ * @return 0 for success, else an error code.
+ */
 ndn_Error ndn_SocketTransport_send(struct ndn_SocketTransport *self, unsigned char *data, unsigned int dataLength);
 
+/**
+ * Check if there is data ready on the socket to be received with ndn_SocketTransport_receive.
+ * @param self A pointer to the ndn_SocketTransport struct.
+ * @param receiveIsReady This will be set to 1 if data is ready, 0 if not.
+ * @return 0 for success, else an error code.
+ */
+ndn_Error ndn_SocketTransport_receiveIsReady(struct ndn_SocketTransport *self, int *receiveIsReady);
+
+/**
+ * Receive data from the socket.  NOTE: This is a blocking call.  You should first call ndn_SocketTransport_receiveIsReady
+ * to make sure there is data ready to receive.
+ * @param self A pointer to the ndn_SocketTransport struct.
+ * @param buffer A pointer to the buffer to receive the data.
+ * @param bufferLength The maximum length of buffer.
+ * @param nBytes Return the number of bytes received into buffer.
+ * @return 0 for success, else an error code.
+ */
 ndn_Error ndn_SocketTransport_receive
   (struct ndn_SocketTransport *self, unsigned char *buffer, unsigned int bufferLength, unsigned int *nBytes);
 
+/**
+ * Close the socket.
+ * @param self A pointer to the ndn_SocketTransport struct.
+ * @return 0 for success, else an error code.
+ */
 ndn_Error ndn_SocketTransport_close(struct ndn_SocketTransport *self);
 
 #ifdef __cplusplus