diff --git a/scripts/env/envinf1/petsc.sh b/scripts/env/envinf1/petsc.sh
index 3034a713cc0a40f2e880d218c1574735a011cb55..7c2b3abf2ae9af86764c3164518ee92f723e7980 100644
--- a/scripts/env/envinf1/petsc.sh
+++ b/scripts/env/envinf1/petsc.sh
@@ -6,3 +6,11 @@ fi
 
 source $DIR/mpi.sh
 module load petsc/3.7.6_maint_gcc6.2.0_openmpi_gcc_1.8.8-1
+
+echo -e "Note: If you want to run a simulation on the cluster be aware of the "\
+     "mixed CPU architecture. There are Sandy-Bridge-based nodes (orte-28, "\
+     "frontend2, envinf1) as well as Skylake-based nodes (orte-40, frontend1)"\
+     ".\nConsider setting CMake-option OGS_CPU_ARCHITECTURE to:\n\n"\
+     "  -DOGS_CPU_ARCHITECTURE=sandybridge\n"\
+     "   -- OR --\n"\
+     "  -DOGS_CPU_ARCHITECTURE=skylake-avx512"
diff --git a/scripts/env/frontend1/petsc.sh b/scripts/env/frontend1/petsc.sh
index 3034a713cc0a40f2e880d218c1574735a011cb55..7c2b3abf2ae9af86764c3164518ee92f723e7980 100644
--- a/scripts/env/frontend1/petsc.sh
+++ b/scripts/env/frontend1/petsc.sh
@@ -6,3 +6,11 @@ fi
 
 source $DIR/mpi.sh
 module load petsc/3.7.6_maint_gcc6.2.0_openmpi_gcc_1.8.8-1
+
+echo -e "Note: If you want to run a simulation on the cluster be aware of the "\
+     "mixed CPU architecture. There are Sandy-Bridge-based nodes (orte-28, "\
+     "frontend2, envinf1) as well as Skylake-based nodes (orte-40, frontend1)"\
+     ".\nConsider setting CMake-option OGS_CPU_ARCHITECTURE to:\n\n"\
+     "  -DOGS_CPU_ARCHITECTURE=sandybridge\n"\
+     "   -- OR --\n"\
+     "  -DOGS_CPU_ARCHITECTURE=skylake-avx512"