diff --git a/etc/config.csh/mpi b/etc/config.csh/mpi
index 3c59434eb81b8a3b62f95ee3857dff037f467c65..0dcad59332c0c9aa528be2304a2ddc843b385373 100644
--- a/etc/config.csh/mpi
+++ b/etc/config.csh/mpi
@@ -25,6 +25,9 @@
 #     For USERMPI, the user is responsible for supplying an appropriate
 #     wmake/rules/General/mplibUSERMPI file and managing all settings
 #
+#     For INTELMPI, note that the (I_MPI_CC, I_MPI_CCX) environment variables
+#     define the underlying compiler to be used
+#
 #------------------------------------------------------------------------------
 unsetenv MPI_ARCH_PATH MPI_HOME
 setenv FOAM_MPI dummy  # Fallback value
diff --git a/etc/config.sh/mpi b/etc/config.sh/mpi
index bba158bc4e839a1021f17da95946e591a49515dc..28b95885d329b5efd587ab7765b9c61ab5983fb4 100644
--- a/etc/config.sh/mpi
+++ b/etc/config.sh/mpi
@@ -25,6 +25,9 @@
 #     For USERMPI, the user is responsible for supplying an appropriate
 #     wmake/rules/General/mplibUSERMPI file and managing all settings
 #
+#     For INTELMPI, note that the (I_MPI_CC, I_MPI_CCX) environment variables
+#     define the underlying compiler to be used
+#
 #------------------------------------------------------------------------------
 unset MPI_ARCH_PATH MPI_HOME
 export FOAM_MPI=dummy  # Fallback value