diff --git a/ui/commands/telnet.js b/ui/commands/telnet.js
index 98f5c71..e15fe70 100644
--- a/ui/commands/telnet.js
+++ b/ui/commands/telnet.js
@@ -459,6 +459,7 @@ export class Command {
     let charset = "utf-8";
 
     if (d.length > 1) {
+      // TODO: Remove this check after depreciation period.
       try {
         initialFieldDef["Encoding"].verify(d[1]);