diff --git a/src/main/knn/KnnGraphTester.java b/src/main/knn/KnnGraphTester.java
index a1e243b9..cf296dc6 100644
--- a/src/main/knn/KnnGraphTester.java
+++ b/src/main/knn/KnnGraphTester.java
@@ -402,7 +402,7 @@ private void run(String... args) throws Exception {
         indexSizeOnDiskBytes += dir.fileLength(fileName);
       }
       indexSizeOnDiskMB = indexSizeOnDiskBytes / 1024. / 1024.;
-      System.out.println(String.format(Locale.ROOT, "index disk uage is %.2f MB", indexSizeOnDiskMB));
+      System.out.println(String.format(Locale.ROOT, "index disk usage is %.2f MB", indexSizeOnDiskMB));
     }
     if (operation != null) {
       switch (operation) {