diff --git a/src/dns/gandi.js b/src/dns/gandi.js
index 081600151..09e992f9b 100644
--- a/src/dns/gandi.js
+++ b/src/dns/gandi.js
@@ -35,7 +35,7 @@ function upsert(dnsConfig, zoneName, subdomain, type, values, callback) {
 
     var data = {
         'rrset_ttl': 300, // this is the minimum allowed
-        'rrset_values': values
+        'rrset_values': values // for mx records, value is already of the '<priority> <server>' format
     };
 
     superagent.put(`${GANDI_API}/domains/${zoneName}/records/${subdomain}/${type}`)
diff --git a/src/dns/route53.js b/src/dns/route53.js
index 643f4460a..99a9ea232 100644
--- a/src/dns/route53.js
+++ b/src/dns/route53.js
@@ -87,7 +87,7 @@ function add(dnsConfig, zoneName, subdomain, type, values, callback) {
         if (error) return callback(error);
 
         var fqdn = subdomain === '' ? zoneName : subdomain + '.' + zoneName;
-        var records = values.map(function (v) { return { Value: v }; });
+        var records = values.map(function (v) { return { Value: v }; });  // for mx records, value is already of the '<priority> <server>' format
 
         var params = {
             ChangeBatch: {