diff --git a/etc/templates/compressibleInflowOutflow/system/blockMeshDict b/etc/templates/compressibleInflowOutflow/system/blockMeshDict
index f72145d4bb08bb4a0b456005fc5a12d47532f1c2..09757b92d3b6671c438ce52a100eda8bf2b7339a 100644
--- a/etc/templates/compressibleInflowOutflow/system/blockMeshDict
+++ b/etc/templates/compressibleInflowOutflow/system/blockMeshDict
@@ -59,6 +59,7 @@ edges
 
 boundary
 (
+//  Uncomment below to define patches in background mesh
 /*
     left
     {
diff --git a/etc/templates/inflowOutflow/system/blockMeshDict b/etc/templates/inflowOutflow/system/blockMeshDict
index f72145d4bb08bb4a0b456005fc5a12d47532f1c2..09757b92d3b6671c438ce52a100eda8bf2b7339a 100644
--- a/etc/templates/inflowOutflow/system/blockMeshDict
+++ b/etc/templates/inflowOutflow/system/blockMeshDict
@@ -59,6 +59,7 @@ edges
 
 boundary
 (
+//  Uncomment below to define patches in background mesh
 /*
     left
     {