diff --git a/es/CMakeLists.txt b/es/CMakeLists.txt
index 2225842..aa11477 100644
--- a/es/CMakeLists.txt
+++ b/es/CMakeLists.txt
@@ -6,3 +6,4 @@ Project(es C CXX)
 
 add_subdirectory(blatt1)
 add_subdirectory(blatt2)
+add_subdirectory(blatt3)