Update Cypher.md

demos/guru_scripts/docker/tutorial/4.x/Cypher.md

@@ -20,6 +20,7 @@ This GSQL tutorial contains
   - [Node Pattern](#node-pattern)
   - [Edge Pattern](#edge-pattern)
   - [Path Pattern](#path-pattern)
+  - [Optional Match](#optional-match)
   - [With Clause](#with-clause)
   - [Sorting and Limiting Results](#sorting-and-limiting-results)
   - [Working With List](#working-with-list)
@@ -348,6 +349,9 @@ The result is shown in [c8.out](https://github.com/tigergraph/ecosys/blob/master
 
 [Go back to top](#top)
 
+## Optional Match
+`OPTIONAL MATCH` matches patterns against your graph, just like MATCH does. The difference is that if no matches are found, OPTIONAL MATCH will use a null for missing parts of the pattern.
+
 ## With Clause
 
 The WITH clause in Cypher is used to chain parts of a query, pass intermediate results to the next part, or perform transformations like aggregation. It acts as a way to manage query scope and handle intermediate data without exposing everything to the final result.