diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..f901f6e
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,8 @@
+# 3D Slicer's extension build tool defines CollageRadiomics_BUILD_SLICER_EXTENSION:BOOL=ON
+# to indicate that this project is being built as a 3D Slicer extension.
+if (CollageRadiomics_BUILD_SLICER_EXTENSION)
+  message(STATUS "Building project as a Slicer extension")
+  project(CollageRadiomics)
+  add_subdirectory(slicer)
+  return()
+endif()