diff --git a/etc/templates/compressibleInflowOutflow/system/blockMeshDict b/etc/templates/compressibleInflowOutflow/system/blockMeshDict
index f72145d4bb..09757b92d3 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 f72145d4bb..09757b92d3 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
     {