Add rst:directive:option directive

doc/usage/restructuredtext/domains.rst

@@ -1423,6 +1423,29 @@ The reStructuredText domain (name **rst**) provides the following directives:
 
          Bar description.
 
+.. rst:directive:: .. rst:directive:option:: name
+
+   Describes an option for reST directive.  The *name* can be a single option
+   name or option name with arguments which separated with colon (``:``).
+   For example::
+
+       .. rst:directive:: toctree
+
+          .. rst:directive:option:: caption: caption of ToC
+
+          .. rst:directive:option:: glob
+
+   will be rendered as:
+
+       .. rst:directive:: toctree
+          :noindex:
+
+          .. rst:directive:option:: caption: caption of ToC
+
+          .. rst:directive:option:: glob
+
+   .. versionadded:: 2.1
+
 .. rst:directive:: .. rst:role:: name
 
    Describes a reST role.  For example::