diff --git a/board-builder-impl-egui/src/main.rs b/board-builder-impl-egui/src/main.rs
index b285d73..5668c7b 100644
--- a/board-builder-impl-egui/src/main.rs
+++ b/board-builder-impl-egui/src/main.rs
@@ -8,6 +8,7 @@ use rfd::FileDialog;
 use board_builder::{ Board, CoordTransformer, read_board_from_file, write_board_to_file };
 
 use std::path::Path;
+use std::collections::HashSet;
 use std::rc::Rc;
 use std::cell::RefCell;
 
@@ -303,9 +304,15 @@ impl EditLabelsDialog {
                 if self.add_key_dialog.open {
                     if let StringDialogResponse::Accepted(key) =
                         self.add_key_dialog.ui(ui, "Add Key") {
-                            board.labels.insert(key, Vec::new());
+                            board.labels.insert(key, HashSet::new());
                         }
                 }
+                if self.add_value_dialog.open && selected_label_key != &String::new() {
+                    if let StringDialogResponse::Accepted(value) =
+                        self.add_value_dialog.ui(ui, "Add Value") {
+                            board.labels.get_mut(selected_label_key).unwrap().insert(value);
+                        }
+                    }
             });
     }
 }
diff --git a/board.zip b/board.zip
index 07a2e2f..a15919d 100644
Binary files a/board.zip and b/board.zip differ
diff --git a/src/lib.rs b/src/lib.rs
index a1c1373..e856c6d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,7 +14,7 @@ pub struct Node {
 #[derive(Serialize, Deserialize, Debug, Default)]
 #[serde(default)]
 pub struct Board {
-    pub labels: HashMap<String, Vec<String>>,
+    pub labels: HashMap<String, HashSet<String>>,
     pub nodes: HashMap<usize, Node>,
 }
 impl Board {