diff --git a/syntaxes/diagrams/graph.yaml b/syntaxes/diagrams/graph.yaml
index f8f2d62..08e80a1 100644
--- a/syntaxes/diagrams/graph.yaml
+++ b/syntaxes/diagrams/graph.yaml
@@ -1,5 +1,5 @@
 - comment: Graph
-  begin: ^\s*(graph|flowchart)\s+([\p{Letter}\ 0-9]+)?
+  begin: ^\s*(graph|flowchart(?:-elk)?)\s+([\p{Letter}\ 0-9]+)?
   beginCaptures:
     '1':
       name: keyword.control.mermaid