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-rw-r--r--LUFA/Drivers/USB/LowLevel/Pipe.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/LUFA/Drivers/USB/LowLevel/Pipe.h b/LUFA/Drivers/USB/LowLevel/Pipe.h
index 3f512c0d2..25121cafa 100644
--- a/LUFA/Drivers/USB/LowLevel/Pipe.h
+++ b/LUFA/Drivers/USB/LowLevel/Pipe.h
@@ -389,6 +389,8 @@
* is an IN direction and no packet (or an empty packet) has been received, or if the pipe is an OUT
* direction and the pipe bank is full.
*
+ * \note This function is not valid on CONTROL type pipes.
+ *
* \ingroup Group_PipePacketManagement
*
* \return Boolean true if the currently selected pipe may be read from or written to, depending on its direction