diff --git a/es/CMakeLists.txt b/es/CMakeLists.txt
index b642e5d..1cc7e8c 100644
--- a/es/CMakeLists.txt
+++ b/es/CMakeLists.txt
@@ -9,3 +9,4 @@ add_subdirectory(blatt2)
 add_subdirectory(blatt3)
 add_subdirectory(blatt4)
 add_subdirectory(blatt5)
+add_subdirectory(blatt6)