README in trac-wiki-0.3.20 vs README in trac-wiki-0.3.21

@@ -116,9 +116,14 @@
    * `$1`, `$2` parameters send to template {{template ONE|TWO}}
    * parameters send to template can be named {{template ahoj=test|hi=west}}
    * `$0` all parameters (without named)
    * `$00` all parameters (with named)
 
+* `{{unknown_macro par1}}` is expanded  to `{{unkmacro unknown_macro|par1}}`,
+   you have to specify `uknmacro` macro. If not, error strig
+   `UNKNOWN-MACRO(unkmacro)`
+   is generated.
+
 * `{{!command}}`
 
 == BUGS ==
 
 If you found a bug, please report it at the TracWiki project's tracker