diff --git a/src/assets/images/front/data_contract_3d.PNG b/src/assets/images/front/data-contract-3d.png
similarity index 100%
rename from src/assets/images/front/data_contract_3d.PNG
rename to src/assets/images/front/data-contract-3d.png
diff --git a/src/assets/images/front/orig/data_contract_2d.PNG b/src/assets/images/front/orig/data-contract-2d.png
similarity index 100%
rename from src/assets/images/front/orig/data_contract_2d.PNG
rename to src/assets/images/front/orig/data-contract-2d.png
diff --git a/src/html/index.md b/src/html/index.md
index 0f74cbe..2165245 100644
--- a/src/html/index.md
+++ b/src/html/index.md
@@ -4,7 +4,7 @@ description: Frontpage
 priority: 1.0
 ---
 <!-- TODO: data-contract-3d image should be placed above dashbox image (and scaled and fine positioned) -->
-[![dashbox]({{ root }}images/front/data_contract_3d.png)]({{ root }}docs/)
+[![dashbox]({{ root }}images/front/data-contract-3d.png)]({{ root }}docs/)
 
 ## Tools, Examples and Inspiration for Data Contracts