Documentation: Improve details of libusb_transfer's 'user_data' field
Closes #351
Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
diff --git a/libusb/libusb.h b/libusb/libusb.h
index da6b1e5..e9f5253 100644
--- a/libusb/libusb.h
+++ b/libusb/libusb.h
@@ -1254,7 +1254,16 @@
* fails, or is cancelled. */
libusb_transfer_cb_fn callback;
- /** User context data to pass to the callback function. */
+ /** User context data. Useful for associating specific data to a transfer
+ * that can be accessed from within the callback function.
+ *
+ * This field may be set manually or is taken as the `user_data` parameter
+ * of the following functions:
+ * - libusb_fill_bulk_transfer()
+ * - libusb_fill_bulk_stream_transfer()
+ * - libusb_fill_control_transfer()
+ * - libusb_fill_interrupt_transfer()
+ * - libusb_fill_iso_transfer() */
void *user_data;
/** Data buffer */
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 0782b51..a0185be 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11543
+#define LIBUSB_NANO 11544
