diff --git a/documentation/rule-language.md b/documentation/rule-language.md
index 68ace3c..6105544 100644
--- a/documentation/rule-language.md
+++ b/documentation/rule-language.md
@@ -15,12 +15,11 @@ The rule language grammar, expressed in a BNF-like syntax, is the following:
     target ::= "allow" | "block" | "reject".
 
     device_id ::= "*:*" | vendor_id ":*" | vendor_id ":" product_id.
+    device_id ::= .
 
-    device_attributes ::= device_attributes | attribute.
-    device_attributes ::= .
+    device_attributes ::= device_attributes attribute. | attribute.
 
-    conditions ::= conditions | condition.
-    conditions ::= .
+    conditions ::= conditions condition. | condition.
 
 See [Device attributes](https://github.com/dkopecek/usbguard#device-attributes) section for the list of available attributes and [Conditions](https://github.com/dkopecek/usbguard#conditions) for the list of supported rule conditions.