diff --git a/ast/spec.md b/ast/spec.md
index 839239353b..1dd5be0282 100644
--- a/ast/spec.md
+++ b/ast/spec.md
@@ -863,7 +863,7 @@ interface MemberExpression <: Expression, Pattern {
 }
 ```
 
-A member expression. If `computed` is `true`, the node corresponds to a computed (`a[b]`) member expression and `property` is an `Expression`. If `computed` is `false`, the node corresponds to a static (`a.b`) member expression and `property` is an `Identifier`. The `optional` flags indecates that the member expression can be called even if the object is null or undefined. If this is the object value (null/undefined) should be returned.
+A member expression. If `computed` is `true`, the node corresponds to a computed (`a[b]`) member expression and `property` is an `Expression`. If `computed` is `false`, the node corresponds to a static (`a.b`) member expression and `property` is an `Identifier`. The `optional` flags indicates that the member expression can be called even if the object is null or undefined. If this is the object value (null/undefined) should be returned.
 
 ### BindExpression