diff --git a/egui_extras/src/grid.rs b/egui_extras/src/grid.rs
index 0234835b..9c42ede4 100644
--- a/egui_extras/src/grid.rs
+++ b/egui_extras/src/grid.rs
@@ -5,6 +5,10 @@ use crate::{
 };
 use egui::Ui;
 
+/// The direction in which cells are positioned in the grid.
+///
+/// In a horizontal grid cells are positions from left to right.
+/// In a vertical grid cells are positions from top to bottom.
 enum GridDirection {
     Horizontal,
     Vertical,