doc: mention how to make inverted jumbo article cover.

diff --git a/doc/pelican/theme.rst b/doc/pelican/theme.rst
index ab6be0a2108452c306c20329c7d5a4f61575312d..66c9c53bb5b896fd95cb32344815ceedc7ac406f 100644 (file)
--- a/doc/pelican/theme.rst
+++ b/doc/pelican/theme.rst
@@ -464,7 +464,9 @@ title and subtitle that's then rendered in a different font size. Example:
     Article contents.
 
 Sidebar with tag, category and author list shown in the classic article layout
-on the right is moved to the bottom for jumbo articles.
+on the right is moved to the bottom for jumbo articles. In case you need to
+invert text color on cover, add a :rst:`:class:` field containing the
+``m-inverted`` CSS class.
 
 .. note-info::