diff --git a/modules/overrungl.nfd/src/main/java/overrungl/nfd/NFD.java b/modules/overrungl.nfd/src/main/java/overrungl/nfd/NFD.java
index c1188345..e935fa06 100644
--- a/modules/overrungl.nfd/src/main/java/overrungl/nfd/NFD.java
+++ b/modules/overrungl.nfd/src/main/java/overrungl/nfd/NFD.java
@@ -59,22 +59,23 @@
  * {@snippet lang = java:
  * import overrungl.util.value.Pair;
  * void main() {
- *     NFD.init();
+ *     var nfd = NFD.INSTANCE;
+ *     nfd.init();
  *
  *     try (MemoryStack stack = MemoryStack.stackPush()) {
  *         String[] outPath = new String[1];
  *         var filterItem = NFDNFilterItem.create(stack,
  *             new Pair<>("Source code", "java"),
  *             new Pair<>("Image file", "png,jpg"));
- *         var result = NFD.openDialogN(outPath, filterItem, null);
+ *         var result = nfd.openDialogN(outPath, filterItem, null);
  *         switch (result) {
- *             case ERROR -> System.err.println(STR."Error: \{NFD.getError()}");
+ *             case ERROR -> System.err.println(STR."Error: \{nfd.getError()}");
  *             case OKAY -> System.out.println(STR."Success! \{outPath[0]}");
  *             case CANCEL -> System.out.println("User pressed cancel.");
  *         }
  *     }
  *
- *     NFD.quit();
+ *     nfd.quit();
  * }}
  *
  * <h3>File Filter Syntax</h3>
diff --git a/modules/overrungl.nfd/src/main/java/overrungl/nfd/NFDResult.java b/modules/overrungl.nfd/src/main/java/overrungl/nfd/NFDResult.java
index 125c6b91..8d3054b3 100644
--- a/modules/overrungl.nfd/src/main/java/overrungl/nfd/NFDResult.java
+++ b/modules/overrungl.nfd/src/main/java/overrungl/nfd/NFDResult.java
@@ -57,7 +57,7 @@ public static NFDResult of(int i) {
             case 0 -> ERROR;
             case 1 -> OKAY;
             case 2 -> CANCEL;
-            default -> throw new IllegalArgumentException(i);
+            default -> throw new IllegalArgumentException(STR."Unexpected value: \{i}");
         };
     }