diff --git a/document/asn-dir.txt b/document/asn-dir.txt
index aee65e2..23f873e 100644
--- a/document/asn-dir.txt
+++ b/document/asn-dir.txt
@@ -1,6 +1,7 @@
 # as-dir Template
 # ===============
 # Filename format: AS<Number>
+# Remove any line which starts with '#' when applying
 # AS Name
 NAME=""
 # Owner
diff --git a/document/entity-dir.txt b/document/entity-dir.txt
index be7a0ef..e03dc03 100644
--- a/document/entity-dir.txt
+++ b/document/entity-dir.txt
@@ -1,6 +1,7 @@
 # entity-dir Template
 # ===================
 # Filename format: <Name>
+# Remove any line which starts with '#' when applying
 # Description (maybe short self introduction)
 DESC=""
 # Contact
diff --git a/document/node-dir.txt b/document/node-dir.txt
index d9ed881..06a9a01 100644
--- a/document/node-dir.txt
+++ b/document/node-dir.txt
@@ -1,7 +1,8 @@
 # node-dir Template
 # =================
 # It's used to store ASN information and generate DNS records 
-# that were neither Tunnel /30 or Point to Point Address
+# that were neither Tunnel /30 or Point to Point Address.
+# Remove any line which starts with '#' when applying
 # Filename format: <Node Name>
 # ASN
 ASN=""