diff --git a/README.md b/README.md
index 9c721339..8bd62bf5 100644
--- a/README.md
+++ b/README.md
@@ -214,10 +214,11 @@ $ rg -Tjs foobar
 ```
 
 To see a list of types supported, run `rg --type-list`. To add a new type, use
-`--type-add`:
+`--type-add`, which must be accompanied by a pattern for searching (`rg` won't
+persist your type settings):
 
 ```
-$ rg --type-add 'foo:*.{foo,foobar}'
+$ rg --type-add 'foo:*.{foo,foobar}' -tfoo bar
 ```
 
 The type `foo` will now match any file ending with the `.foo` or `.foobar`