diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8256e80..26ef5c6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,125 +1,127 @@
 # required to specify the c++ standard
 cmake_minimum_required(VERSION 3.0)
 
 # required for install
 include(CMakePackageConfigHelpers)
 include(GNUInstallDirs)
 
 # project settings
 # ----------------
 
 # name
 project(GooseFEM)
 
 # file that contains the version information
 set(parse_version src/${PROJECT_NAME}/${PROJECT_NAME}.h)
 
 # header files
 set(headers
   src/GooseFEM/GooseFEM.h
   src/GooseFEM/Mesh.hpp
   src/GooseFEM/Mesh.h
   src/GooseFEM/MeshTri3.hpp
   src/GooseFEM/MeshTri3.h
   src/GooseFEM/MeshQuad4.hpp
   src/GooseFEM/MeshQuad4.h
   src/GooseFEM/MeshHex8.hpp
   src/GooseFEM/MeshHex8.h
   src/GooseFEM/Element.hpp
   src/GooseFEM/Element.h
   src/GooseFEM/ElementQuad4.hpp
   src/GooseFEM/ElementQuad4.h
+  src/GooseFEM/ElementHex8.hpp
+  src/GooseFEM/ElementHex8.h
   src/GooseFEM/Vector.hpp
   src/GooseFEM/Vector.h
   src/GooseFEM/MatrixDiagonal.hpp
   src/GooseFEM/MatrixDiagonal.h
   src/GooseFEM/Iterate.hpp
   src/GooseFEM/Iterate.h
   src/GooseFEM/Dynamics.hpp
   src/GooseFEM/Dynamics.h
 )
 
 # automatically parse the version number
 file(READ "${parse_version}" version)
 string(REGEX MATCH "define[ \t]+GOOSEFEM_WORLD_VERSION[ \t]+([0-9]+)" _ "${version}")
 set(world_version "${CMAKE_MATCH_1}")
 string(REGEX MATCH "define[ \t]+GOOSEFEM_MAJOR_VERSION[ \t]+([0-9]+)" _ "${version}")
 set(major_version "${CMAKE_MATCH_1}")
 string(REGEX MATCH "define[ \t]+GOOSEFEM_MINOR_VERSION[ \t]+([0-9]+)" _ "${version}")
 set(minor_version "${CMAKE_MATCH_1}")
 set(GOOSEFEM_VERSION_NUMBER ${world_version}.${major_version}.${minor_version})
 
 # paths
 # -----
 
 set(GOOSEFEM_ROOT_DIR        "${CMAKE_INSTALL_PREFIX}")
 set(GOOSEFEM_INCLUDE_DIR     "${CMAKE_INSTALL_PREFIX}/${INCLUDE_INSTALL_DIR}")
 set(INCLUDE_INSTALL_DIR      "${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}")
 set(CMAKEPACKAGE_INSTALL_DIR "${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME}")
 set(PKGCONFIG_INSTALL_DIR    "${CMAKE_INSTALL_DATADIR}/pkgconfig")
 set(fcmake                   "${PROJECT_NAME}Config.cmake")
 set(fpkg                     "${PROJECT_NAME}.pc")
 
 # options
 # -------
 
 # configure pkg-config (default: on)
 option(PKGCONFIG "Build pkg-config ${fpkg} file" ON)
 
 # disable pkg-config for native Windows builds
 if(WIN32 OR CMAKE_HOST_SYSTEM_NAME MATCHES Windows)
   option(PKGCONFIG "Build pkg-config ${fpkg} file" OFF)
 endif()
 
 # C++ standard
 # ------------
 
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 if(NOT CMAKE_CXX_STANDARD OR CMAKE_CXX_STANDARD LESS 14)
   set(CMAKE_CXX_STANDARD 14)
 endif()
 
 # configure CMake
 # ---------------
 
 configure_package_config_file(
   ${CMAKE_CURRENT_SOURCE_DIR}/${PROJECT_NAME}Config.cmake.in
   ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
   PATH_VARS GOOSEFEM_INCLUDE_DIR GOOSEFEM_ROOT_DIR
   INSTALL_DESTINATION ${CMAKEPACKAGE_INSTALL_DIR}
   NO_CHECK_REQUIRED_COMPONENTS_MACRO
 )
 
 # install
 # -------
 
 # pkg-config
 if(PKGCONFIG)
   configure_file(${fpkg}.in ${fpkg} @ONLY)
   install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${fpkg} DESTINATION ${PKGCONFIG_INSTALL_DIR})
 endif()
 
 # CMake
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${fcmake} DESTINATION ${CMAKEPACKAGE_INSTALL_DIR})
 
 # header files
 install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${headers} DESTINATION ${INCLUDE_INSTALL_DIR})
 
 # print information to screen
 # ---------------------------
 
 message(STATUS "")
 message(STATUS "+---------------------------------------------------------------------------------")
 message(STATUS "|")
 message(STATUS "| Use 'make install' to install in")
 message(STATUS "|   ${CMAKE_INSTALL_PREFIX}")
 message(STATUS "|")
 message(STATUS "| To specify a custom directory call")
 message(STATUS "|   cmake /path/to/${PROJECT_NAME} -DCMAKE_INSTALL_PREFIX=yourprefix")
 message(STATUS "|")
 message(STATUS "| For custom paths, add the following line to your '~/.bashrc'")
 message(STATUS "|   export PKG_CONFIG_PATH=${CMAKE_INSTALL_PREFIX}/share/pkgconfig:$PKG_CONFIG_PATH")
 message(STATUS "|")
 message(STATUS "+---------------------------------------------------------------------------------")
 message(STATUS "")