As this class is part of the ABI used by both Sphinx kerneldoc
extension and docs/tools/kernel-doc, better describe what
parmeters are used to initialize ManOutput class.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 tools/lib/python/kdoc/kdoc_output.py | 29 +++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/tools/lib/python/kdoc/kdoc_output.py b/tools/lib/python/kdoc/kdoc_output.py
index fb44cc8e0770..1e3dc47bc696 100644
--- a/tools/lib/python/kdoc/kdoc_output.py
+++ b/tools/lib/python/kdoc/kdoc_output.py
@@ -580,7 +580,34 @@ class RestFormat(OutputFormat):
 
 
 class ManFormat(OutputFormat):
-    """Consts and functions used by man pages output."""
+    """
+    Consts and functions used by man pages output.
+
+    This class has one mandatory parameter and some optional ones, which
+    are needed to define the title header contents:
+
+    ``modulename``
+        Defines the module name to be used at the troff ``.TH`` output.
+
+        This argument is mandatory.
+
+    ``section``
+        Usually a numeric value from 0 to 9, but man pages also accept
+        some strings like "p".
+
+        Defauls to ``9``
+
+    ``manual``
+        Defaults to ``Kernel API Manual``.
+
+    The above controls the output of teh corresponding fields on troff
+    title headers, which will be filled like this::
+
+        .TH "{name}" {section} "{date}" "{modulename}" "{manual}"
+
+    where ``name``` will match the API symbol name, and ``date`` will be
+    either the date where the Kernel was compiled or the current date
+    """
 
     highlights = (
         (type_constant, r"\1"),
-- 
2.52.0