diff --git a/FCCee/ALLEGRO/compact/ALLEGRO_o1_v03/ALLEGRO_o1_v03.xml b/FCCee/ALLEGRO/compact/ALLEGRO_o1_v03/ALLEGRO_o1_v03.xml
index 10d691e05..7606b7f23 100644
--- a/FCCee/ALLEGRO/compact/ALLEGRO_o1_v03/ALLEGRO_o1_v03.xml
+++ b/FCCee/ALLEGRO/compact/ALLEGRO_o1_v03/ALLEGRO_o1_v03.xml
@@ -34,6 +34,8 @@
   <include ref="../../../MDI/compact/MDI_o1_v00/Beampipe_o4_v05.xml" />
   <include ref="../../../MDI/compact/MDI_o1_v00/BeamInstrumentation_o1_v01.xml" />
   
+  <!-- In order to use the CAD beampipe, build k4geo with the following CMake option: 
+  cmake -D INSTALL_BEAMPIPE_STL_FILES=ON which will download the files needed -->
   <!-- engineered CAD model of the beam pipe -->
   <!-- <include ref="../../../MDI/compact/MDI_o1_v01/Beampipe_CADimport_o1_v02.xml" /> -->
   <!-- <include ref="../../../MDI/compact/MDI_o1_v01/BeamInstrumentation_o1_v01.xml"/> -->
diff --git a/FCCee/IDEA/compact/IDEA_o1_v03/IDEA_o1_v03.xml b/FCCee/IDEA/compact/IDEA_o1_v03/IDEA_o1_v03.xml
index 05bc28df0..341278a13 100644
--- a/FCCee/IDEA/compact/IDEA_o1_v03/IDEA_o1_v03.xml
+++ b/FCCee/IDEA/compact/IDEA_o1_v03/IDEA_o1_v03.xml
@@ -37,7 +37,10 @@
   <!-- shape based model of the beam pipe -->
   <include ref="../../../MDI/compact/MDI_o1_v00/Beampipe_o4_v05.xml" />
   <include ref="../../../MDI/compact/MDI_o1_v00/BeamInstrumentation_o1_v01.xml" />
+  
   <!-- engineered CAD model of the beam pipe -->
+  <!-- In order to use the CAD beampipe, build k4geo with the following CMake option: 
+  cmake -D INSTALL_BEAMPIPE_STL_FILES=ON which will download the files needed -->
   <!-- <include ref="../../../MDI/compact/MDI_o1_v01/Beampipe_CADimport_o1_v02.xml" /> -->
   <!-- <include ref="../../../MDI/compact/MDI_o1_v01/BeamInstrumentation_o1_v01.xml"/> -->
   <include ref="LumiCal_o1_v01.xml"/>