diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1b67fb8..807bdb7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,7 @@ FetchContent_Declare(
 )
 FetchContent_MakeAvailable(eigen)
 
-include_directories(${PROJECT_SOURCE_DIR}/include)
+include_directories(${PROJECT_SOURCE_DIR}/include ${PROJECT_SOURCE_DIR}/Geometry)
 
 add_subdirectory(src)
 
diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index c5a8f51..c5c5918 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -1,3 +1,3 @@
-add_executable(Geometry main.cpp)
+add_executable(app main.cpp)
 
-target_link_libraries(Geometry PUBLIC Eigen3::Eigen)
+target_link_libraries(app PUBLIC Eigen3::Eigen)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8009f94..a18cecd 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,6 +1,12 @@
-set(HEADER_LIST "${Geometry_SOURCE_DIR}/include/Geometry/dummy.h")
+set(HEADER_LIST "${Geometry_SOURCE_DIR}/Geometry/dummy.h")
+
+add_library(Geometry Dummy.cpp ${HEADER_LIST})
+
+target_include_directories(Geometry PUBLIC "${PROJECT_SOURCE_DIR}/include" "${PROJECT_SOURCE_DIR}/Geometry")
+
 source_group(
-        TREE "${PROJECT_SOURCE_DIR}/include"
+        TREE "${PROJECT_SOURCE_DIR}/Geometry"
         PREFIX "Header Files"
         FILES ${HEADER_LIST}
-)
\ No newline at end of file
+)
+
diff --git a/src/Dummy.cpp b/src/Dummy.cpp
new file mode 100644
index 0000000..400c59a
--- /dev/null
+++ b/src/Dummy.cpp
@@ -0,0 +1,4 @@
+//
+// Created by nb on 31.12.23.
+//
+#include "dummy.h"
\ No newline at end of file