diff --git a/packages/mermaid/src/docs/syntax/flowchart.md b/packages/mermaid/src/docs/syntax/flowchart.md
index 1213dcddc..a49e974ab 100644
--- a/packages/mermaid/src/docs/syntax/flowchart.md
+++ b/packages/mermaid/src/docs/syntax/flowchart.md
@@ -709,9 +709,9 @@ flowchart LR
     classDef foobar stroke:#00f
 ```
 
-### Css classes
+### CSS classes
 
-It is also possible to predefine classes in css styles that can be applied from the graph definition as in the example
+It is also possible to predefine classes in CSS styles that can be applied from the graph definition as in the example
 below:
 
 **Example style**