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-rw-r--r--doc/openocd.texi5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/openocd.texi b/doc/openocd.texi
index 18077ccd..7c3b70e8 100644
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
@@ -2198,7 +2198,10 @@ Every TAP requires at least the following @var{configparams}:
@itemize @bullet
@item @code{-ircapture} @var{NUMBER}
-@*The IDCODE capture command, such as 0x01.
+@*The bit pattern loaded by the TAP into the JTAG shift register
+on entry to the @sc{ircapture} state, such as 0x01.
+JTAG requires the two LSBs of this value to be 01.
+The value is used to verify that instruction scans work correctly.
@item @code{-irlen} @var{NUMBER}
@*The length in bits of the
instruction register, such as 4 or 5 bits.