1 files changed, 8 insertions, 0 deletions
diff --git a/src/graph.php b/src/graph.php
index 1bfc924..14a1b3b 100644
--- a/src/graph.php
+++ b/src/graph.php
@@ -36,6 +36,14 @@ class ezcGraph
      * symbol.
      */
     const ARROW = 4;
+    /**
+     * A square, filled box, symbol
+     */
+    const SQUARE = 5;
+    /**
+     * A non-filled box symbol
+     */
+    const BOX = 6;
 
     /**
      * Constant used for background repetition. No repeat.