Missing since introduced in the driver.

Fixes: commit 8a68ea00a62e ("gpio: mockup: implement naming the lines")
Signed-off-by: Alexander Dahl <a...@thorsis.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt 
b/Documentation/admin-guide/kernel-parameters.txt
index 782dc6d9b7fb..4b12f944ca44 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1464,6 +1464,8 @@
        gpio-mockup.gpio_mockup_ranges
                        [HW] Sets the ranges of gpiochip of for this device.
                        Format: <start1>,<end1>,<start2>,<end2>...
+       gpio-mockup.gpio_mockup_named_lines
+                       [HW] Let the driver know GPIO lines should be named.
 
        gpt             [EFI] Forces disk with valid GPT signature but
                        invalid Protective MBR to be treated as GPT. If the
-- 
2.20.1

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