diff --git a/Static-filter-syntax.md b/Static-filter-syntax.md
index df5cdc6..2856ece 100644
--- a/Static-filter-syntax.md
+++ b/Static-filter-syntax.md
@@ -300,6 +300,8 @@ Essentially, the new `denyallow` option makes it easier to implement default-den
 
 #### `document`
 
+Alias: `doc`.
+
 This is a _type_ option (like `image` or `script`) which specifies _main frame_ (a.k.a. the root document) of a web page. This option is automatically enabled in filters specifying only host part of the URL, see ["HOSTS files" section](#hosts-files). This will cause web pages which match the filter to be subjected to ["Strict blocking"](./Strict-blocking).
 
 See also: [`all`](#all)