diff --git a/eslint/babel-eslint-plugin/README.md b/eslint/babel-eslint-plugin/README.md
index 29a817b314..4fc00c0cdf 100644
--- a/eslint/babel-eslint-plugin/README.md
+++ b/eslint/babel-eslint-plugin/README.md
@@ -32,7 +32,8 @@ original ones as well!).
     "babel/object-curly-spacing": 1,
     "babel/object-shorthand": 1,
     "babel/arrow-parens": 1,
-    "babel/no-await-in-loop": 1
+    "babel/no-await-in-loop": 1,
+    "babel/flow-object-type": 1
   }
 }
 ```
@@ -46,4 +47,11 @@ Each rule corresponds to a core `eslint` rule, and has the same options.
 - `babel/object-curly-spacing`: doesn't complain about `export x from "mod";` or `export * as x from "mod";`
 - `babel/object-shorthand`: doesn't fail when using object spread (`...obj`)
 - `babel/arrow-parens`: Handles async functions correctly
+
+The following rules are not in `eslint`, but are relevant only to syntax that is not specified by
+the current JavaScript standard or supported by `eslint`.
+
 - `babel/no-await-in-loop`: guard against awaiting async functions inside of a loop
+- `babel/flow-object-type`: Require a particular separator between properties in Flow object types.
+  - Use the option `semicolon` to require semicolons (e.g. `type Foo = { bar: number; baz: string }`).
+  - Use the option `comma` to require commas (e.g. `type Foo = { bar: number, baz: string }`).