diff --git a/packages/mermaid/src/docs/Setup.md b/packages/mermaid/src/docs/Setup.md
index d17aec0ea..082f02522 100644
--- a/packages/mermaid/src/docs/Setup.md
+++ b/packages/mermaid/src/docs/Setup.md
@@ -119,7 +119,7 @@ Default value: ['secure', 'securityLevel', 'startOnLoad', 'maxTextSize']
 
 This option controls if the generated ids of nodes in the SVG are generated randomly or based
 on a seed. If set to false, the IDs are generated based on the current date and thus are not
-deterministic. This is the default behaviour.
+deterministic. This is the default behavior.
 
 **Notes**: