diff --git a/docs/gantt.md b/docs/gantt.md
index 907b6ebd3..d428e8182 100644
--- a/docs/gantt.md
+++ b/docs/gantt.md
@@ -231,7 +231,7 @@ gantt
 
 ## Styling
 
-Styling of the a gantt diagram is done by defining a number of css classes.
+Styling of the a gantt diagram is done by defining a number of css classes. During rendering, these classes are extracted from the file located at src/themes/sequence.scss
 
 ### Classes used