diff --git a/docs/latest/advanced/data.md b/docs/latest/advanced/data.md
index 61f69b3c8..0279df004 100644
--- a/docs/latest/advanced/data.md
+++ b/docs/latest/advanced/data.md
@@ -1,6 +1,6 @@
 # Data
 
-## Hierarch
+## Hierarchy
 
 Studies, Series, Instances, Frames