Index: uspace/lib/usbdev/src/request.c
===================================================================
--- uspace/lib/usbdev/src/request.c	(revision 12e689fc81d0eb52c880a9d72ed90824e7d1a5bc)
+++ uspace/lib/usbdev/src/request.c	(revision 94c40ce2fbf2aaad836abc367830f94458ebe367)
@@ -112,5 +112,5 @@
   *	(they will come in USB endianness).
   * @param data_size Size of the @p data buffer
-  * 	(in native endianness).
+  *	(in native endianness).
   * @param actual_data_size Actual size of transfered data
   *        (in native endianness).
@@ -275,4 +275,7 @@
 	}
 
+	/* The wValue field specifies the descriptor type in the high byte
+	 * and the descriptor index in the low byte. USB 1.1 spec p. 189
+	 */
 	const uint16_t wValue = descriptor_index | (descriptor_type << 8);