diff --git a/docs/reference/slate/schema.md b/docs/reference/slate/schema.md
index 12b02bb80..a584fc9cc 100644
--- a/docs/reference/slate/schema.md
+++ b/docs/reference/slate/schema.md
@@ -87,6 +87,7 @@ A dictionary of inlines by type, each with its own set of validation rules.
   nodes: Array,
   normalize: Function,
   parent: Object|Array,
+  previous: Object|Array,
   text: RegExp,
 }
 ```