Since the beginning, SPHINXDIRS was meant to be used by any
subdirectory inside Documentation/ that contains a file named
index.rst on it. The typical usecase for SPHINXDIRS is help
building subsystem-specific documentation, without needing to
wait for the entire building (with can take 3 minutes with
Sphinx 8.x and above, and a lot more with older versions).

Yet, the documentation for such feature was written back in
2016, where almost all index.rst files were at the first
level (Documentation/*/index.rst).

Update the documentation to reflect the way it works.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index d514ab6761dc..c66df29cf0a3 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -104,7 +104,9 @@ dochelp:
 	@echo  '  cleandocs       - clean all generated files'
 	@echo
 	@echo  '  make SPHINXDIRS="s1 s2" [target] Generate only docs of folder s1, s2'
-	@echo  '  valid values for SPHINXDIRS are: $(_SPHINXDIRS)'
+	@echo  '  top level values for SPHINXDIRS are: $(_SPHINXDIRS)'
+	@echo  '  you may also use a subdirectory like SPHINXDIRS=userspace-api/media,'
+	@echo  '  provided that there is an index.rst file at the subdirectory.'
 	@echo
 	@echo  '  make DOCS_THEME={sphinx-theme} selects a different Sphinx theme.'
 	@echo
-- 
2.51.1

Mauro Carvalho Chehab <mchehab+huawei@kernel.org> writes:

> Since the beginning, SPHINXDIRS was meant to be used by any
> subdirectory inside Documentation/ that contains a file named
> index.rst on it. The typical usecase for SPHINXDIRS is help
> building subsystem-specific documentation, without needing to
> wait for the entire building (with can take 3 minutes with
> Sphinx 8.x and above, and a lot more with older versions).
>
> Yet, the documentation for such feature was written back in
> 2016, where almost all index.rst files were at the first
> level (Documentation/*/index.rst).
>
> Update the documentation to reflect the way it works.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> ---
>  Documentation/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/Makefile b/Documentation/Makefile
> index d514ab6761dc..c66df29cf0a3 100644
> --- a/Documentation/Makefile
> +++ b/Documentation/Makefile
> @@ -104,7 +104,9 @@ dochelp:
>  	@echo  '  cleandocs       - clean all generated files'
>  	@echo
>  	@echo  '  make SPHINXDIRS="s1 s2" [target] Generate only docs of folder s1, s2'
> -	@echo  '  valid values for SPHINXDIRS are: $(_SPHINXDIRS)'
> +	@echo  '  top level values for SPHINXDIRS are: $(_SPHINXDIRS)'
> +	@echo  '  you may also use a subdirectory like SPHINXDIRS=userspace-api/media,'
> +	@echo  '  provided that there is an index.rst file at the subdirectory.'
>  	@echo

Applied, thanks.

jon