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commit088fb4ee17("ALSA: doc: cs35l56: Add information about Cirrus Logic CS35L54/56/57") added a new subdirectory with an index file, so this file must be added to the top-level index. Fixes:088fb4ee17("ALSA: doc: cs35l56: Add information about Cirrus Logic CS35L54/56/57") Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Link: https://patch.msgid.link/20250109105657.96860-1-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org>