Update extended.md (exercism#24)

ErikSchierboom · web-flow · commit 92c6dc867390 · 2021-05-07T16:39:08.000+01:00
diff --git a/docs/extended.md b/docs/extended.md
@@ -1,6 +1,6 @@
 # Extended Mode
 
-This allows for more complex pattern and rules than the basic functionality.
+This allows for more complex pattern and rules than the [Basic Mode](./basic.md).
 It adds support for multiline and partial line rules.
 
 It can be configured to only make modifications before the first non-matching code, or throughout the code.
