For clarity, add a reference link to the start of the section on command
documentation that all commands follow some general rules.

Signed-off-by: Tom Rini <[email protected]>
---
After re-reading, I'm not sure Quentin if you were also thinking of
this, so please feel free to Suggested-by as well.

Cc: Quentin Schulz <[email protected]>
Cc: Heinrich Schuchardt <[email protected]>
---
 doc/usage/index.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/usage/index.rst b/doc/usage/index.rst
index 5dbc0fc49107..6f477b842ca0 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -21,6 +21,9 @@ Use U-Boot
 Shell commands
 --------------
 
+For all commands in U-Boot there are some :ref:`usage/cmdline:General rules`
+that apply.
+
 .. toctree::
    :maxdepth: 1
    :glob:
-- 
2.43.0

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