diff --git a/examples/ELASTIC_T/in.elastic b/examples/ELASTIC_T/in.elastic
index 0c6b70b6dc53ed210b637865d9c6735098256d26..47f662e97aac5741e71789f1dbf3e1ed8e1ece8f 100644
--- a/examples/ELASTIC_T/in.elastic
+++ b/examples/ELASTIC_T/in.elastic
@@ -146,6 +146,9 @@ variable C56all equal 0.5*(${C56}+${C65})
 variable C11cubic equal (${C11all}+${C22all}+${C33all})/3.0
 variable C12cubic equal (${C12all}+${C13all}+${C23all})/3.0
 variable C44cubic equal (${C44all}+${C55all}+${C66all})/3.0
+
+# Average moduli for cubic crystals
+
 variable bulkmodulus equal (${C11cubic}+2*${C12cubic})/3.0
 variable shearmodulus1 equal ${C44cubic}
 variable shearmodulus2 equal (${C11cubic}-${C12cubic})/2.0