diff --git a/docs/rules/no-dupe-class-members.md b/docs/rules/no-dupe-class-members.md
index 9c1cc4faa30..48b22e88598 100644
--- a/docs/rules/no-dupe-class-members.md
+++ b/docs/rules/no-dupe-class-members.md
@@ -25,7 +25,6 @@ Examples of **incorrect** code for this rule:
 
 ```js
 /*eslint no-dupe-class-members: "error"*/
-/*eslint-env es6*/
 
 class Foo {
   bar() { }
@@ -37,6 +36,16 @@ class Foo {
   get bar() { }
 }
 
+class Foo {
+  bar;
+  bar;
+}
+
+class Foo {
+  bar;
+  bar() { }
+}
+
 class Foo {
   static bar() { }
   static bar() { }
@@ -47,7 +56,6 @@ Examples of **correct** code for this rule:
 
 ```js
 /*eslint no-dupe-class-members: "error"*/
-/*eslint-env es6*/
 
 class Foo {
   bar() { }
@@ -59,6 +67,16 @@ class Foo {
   set bar(value) { }
 }
 
+class Foo {
+  bar;
+  qux;
+}
+
+class Foo {
+  bar;
+  qux() { }
+}
+
 class Foo {
   static bar() { }
   bar() { }