diff --git a/src/features/boards/board.ts b/src/features/boards/board.ts
index 129f862..f6345b7 100644
--- a/src/features/boards/board.ts
+++ b/src/features/boards/board.ts
@@ -108,7 +108,7 @@ export interface NodeTypeOptions {
     shape: NodeComputable<Shape>;
     /** Whether the node can accept another node being dropped upon it. */
     canAccept?: NodeComputable<boolean, [BoardNode]>;
-    /** The progress value of the node. */
+    /** The progress value of the node, from 0 to 1. */
     progress?: NodeComputable<number>;
     /** How the progress should be displayed on the node. */
     progressDisplay?: NodeComputable<ProgressDisplay>;