diff --git a/doc/index.rst b/doc/index.rst
index 6586a827..742a9cf7 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -263,7 +263,7 @@ Acknowledgements
 ----------------
 
 Funding by the Deutsche Forschungsgemeinschaft (DFG, German Research
-Foundation) is acknowledged – Project Number 431701914.
+Foundation) is acknowledged – Project Number 431701914 and Grant GRK 2805/1.
 
 References
 ----------