Extend BOOTDELAY help text to cover its additional usage within the
bootmenu command.

Signed-off-by: Alex Kiernan <[email protected]>
---

 common/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common/Kconfig b/common/Kconfig
index 4c7a1a9af8..81e88ea77c 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -182,6 +182,10 @@ config BOOTDELAY
          set to -1 to disable autoboot.
          set to -2 to autoboot with no delay and not check for abort
 
+         If this value is >= 0 then it is also used for the default delay
+         before starting the default entry in bootmenu. If it is < 0 then
+         a default value of 10s is used.
+
          See doc/README.autoboot for details.
 
 config USE_BOOTARGS
-- 
2.17.1

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