diff --git a/app/src/main/java/eu/faircode/email/FragmentAccount.java b/app/src/main/java/eu/faircode/email/FragmentAccount.java
index 84d18d9c55..9a3eb0f9f2 100644
--- a/app/src/main/java/eu/faircode/email/FragmentAccount.java
+++ b/app/src/main/java/eu/faircode/email/FragmentAccount.java
@@ -276,6 +276,7 @@ public class FragmentAccount extends FragmentEx {
                 new SimpleTask<SRVRecord>() {
                     @Override
                     protected SRVRecord onLoad(Context context, Bundle args) throws Throwable {
+                        // https://tools.ietf.org/html/rfc6186
                         String dns = "_imaps._tcp." + args.getString("domain");
                         Lookup lookup = new Lookup(dns, Type.SRV);
                         // https://dns.watch/
diff --git a/app/src/main/java/eu/faircode/email/FragmentIdentity.java b/app/src/main/java/eu/faircode/email/FragmentIdentity.java
index 4acb50e34b..bb4194d312 100644
--- a/app/src/main/java/eu/faircode/email/FragmentIdentity.java
+++ b/app/src/main/java/eu/faircode/email/FragmentIdentity.java
@@ -367,6 +367,7 @@ public class FragmentIdentity extends FragmentEx {
                 new SimpleTask<SRVRecord>() {
                     @Override
                     protected SRVRecord onLoad(Context context, Bundle args) throws Throwable {
+                        // https://tools.ietf.org/html/rfc6186
                         String dns = "_submission._tcp." + args.getString("domain");
                         Lookup lookup = new Lookup(dns, Type.SRV);
                         // https://dns.watch/