diff --git a/4-3-horizontal-vector-field.md b/4-3-horizontal-vector-field.md
index 8e9a8f5818f1fc44bc06787f9dd3c48d8c4f2da5..04efb2306cb8dcfa4af61e397c18c13308914289 100644
--- a/4-3-horizontal-vector-field.md
+++ b/4-3-horizontal-vector-field.md
@@ -4,6 +4,8 @@
 
 ![](img/4-3-horizontal-vector-field.png)
 
+> For the terms & names of UI components, refer to _[UI Components](3-1-ui-components)_.
+
 ##### 1. Open data file.
 
 Open your data file(s), using _Open Data_ buttons on the _Home_ menu category of _Menu Bar_.