diff --git a/lib/options.json b/lib/options.json
index 24d29407dc..0392953d43 100644
--- a/lib/options.json
+++ b/lib/options.json
@@ -325,7 +325,14 @@
           "type": "boolean"
         },
         {
-          "enum": ["none", "errors-only", "minimal", "normal", "verbose"]
+          "enum": [
+            "none",
+            "errors-only",
+            "errors-warnings",
+            "minimal",
+            "normal",
+            "verbose"
+          ]
         }
       ]
     },
diff --git a/test/options.test.js b/test/options.test.js
index e659ffcddd..b512216f4a 100644
--- a/test/options.test.js
+++ b/test/options.test.js
@@ -359,6 +359,7 @@ describe('options', () => {
           {},
           'none',
           'errors-only',
+          'errors-warnings',
           'minimal',
           'normal',
           'verbose',