diff --git a/etc/apps/paraview3/bashrc b/etc/apps/paraview3/bashrc
index 9dc6c7683c..cfa2f11337 100644
--- a/etc/apps/paraview3/bashrc
+++ b/etc/apps/paraview3/bashrc
@@ -29,6 +29,8 @@
 #     Setup file for paraview-3.x
 #     Sourced from OpenFOAM-?.?/etc/bashrc
 #
+# Note
+#     The env. variable 'ParaView_DIR' is required for building plugins
 #------------------------------------------------------------------------------
 
 # determine the cmake to be used
diff --git a/etc/apps/paraview3/cshrc b/etc/apps/paraview3/cshrc
index 943371ff3e..875d0d1655 100644
--- a/etc/apps/paraview3/cshrc
+++ b/etc/apps/paraview3/cshrc
@@ -29,6 +29,8 @@
 #     Startup File for paraview-3.x
 #     Sourced from OpenFOAM-?.?/etc/cshrc
 #
+# Note
+#     The env. variable 'ParaView_DIR' is required for building plugins
 #------------------------------------------------------------------------------
 
 # determine the cmake to be used