doc: Explain default options in libusb_set_option documentation

[platform/upstream/libusb.git] / libusb / libusb.h

diff --git a/libusb/libusb.h b/libusb/libusb.h
index 2825b41..7ec3fcf 100644 (file)
--- a/libusb/libusb.h
+++ b/libusb/libusb.h
@@ -982,8 +982,9 @@ struct libusb_version {
  * Sessions are created by libusb_init() and destroyed through libusb_exit().
  * If your application is guaranteed to only ever include a single libusb
  * user (i.e. you), you do not have to worry about contexts: pass NULL in
- * every function call where a context is required. The default context
- * will be used.
+ * every function call where a context is required, and the default context
+ * will be used. Note that libusb_set_option(NULL, ...) is special, and adds
+ * an option to a list of default options for new contexts.
  *
  * For more information, see \ref libusb_contexts.
  */