implemented showsubsectionsatfirstoverview option

README.md

@@ -46,6 +46,8 @@ E.g., `\only<2|handout:0>{This is not shown in handout mode.}`, `\item<1-|handou
 
 - The `overviewatsection` option displays the table of contents at each section. Only subsections of the current section is shown.
 
+- The `showsubsectionsatfirstoverview` option shows all the subsections at the first overview. This requires `overviewatsection` option.
+
 Example: `\documentclass[de, navbaron, kitgrid, handout, overviewatsection]{CELbeamer}`
 
 ## Title Slide
@@ -64,8 +66,10 @@ Additionally, for horizontal layouts, you can choose the color of the KIT logo.
 Example: `\begin{frame}[title white horizontal, picture=images/palladio_bauplan, kitlogo=black]`
 
 ## Special Slides
+### Table of content
 For tables of contents, you can specify the option `tableofcontents=<color>`, where `color` can be either `blue` or `green`. The table of contents will then be shown on a fully colored slide.
 
+### Image slides
 There are also special layouts for divider slides with large images. You can select them using frame options.
 
 | Vertical image share: | Frame Option                   |