Added specification of return value for comedi_dio_bitfield2.

diff --git a/doc/dio_funcref.txt b/doc/dio_funcref.txt
index fc7ef261f1d9a921c7280a2870f3402bfca001af..fb78a6c1d0261a0c49f972b3b161b46ce76d7ccf 100644 (file)
--- a/doc/dio_funcref.txt
+++ b/doc/dio_funcref.txt
@@ -26,6 +26,8 @@ Description:
  For example, the driver may need to sequentially write to
  several registers in order to set all the digital channels specified
  by the <parameter>write_mask</parameter>.
+Returns:
+ If successful, 0 is returned, otherwise -1.
 
 Function: comedi_dio_config -- change input/output properties of channel
 Retval: int