diff --git a/tools/llvmc/doc/LLVMC-Reference.rst b/tools/llvmc/doc/LLVMC-Reference.rst
index 2907784..9190255 100644
--- a/tools/llvmc/doc/LLVMC-Reference.rst
+++ b/tools/llvmc/doc/LLVMC-Reference.rst
@@ -353,6 +353,12 @@
 
    - ``required`` - this option is obligatory.
 
+   - ``hidden`` - this option should not appear in the ``--help``
+     output (but should appear in the ``--help-hidden`` output).
+
+   - ``really_hidden`` - the option should not appear in any help
+     output.
+
 
 Option list - specifying all options in a single place
 ======================================================