diff --git a/README.md b/README.md
index 448c7da..07dfbd4 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ More infos on Datenspuren can be found at [http://datenspuren.de](http://datensp
 
 
 ![Slightly Advanced Prototype Hardware](/c3d2/pentabug/raw/master/img/prototype.jpg)
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+Img. 1: A slightly advanced prototype version of the bug with single layer pcb.
 
 ![Top Layer of Version 1.0 Board](https://github.com/c3d2/pentabug/raw/master/img/board_top.png)
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+Img. 2: The top layer view of the Version 1.0 production board (two layer pcb).