diff --git a/Document/Distance.ipynb b/Document/Distance.ipynb
index b9322545..467cb7e7 100644
--- a/Document/Distance.ipynb
+++ b/Document/Distance.ipynb
@@ -3007,7 +3007,7 @@
    "metadata": {},
    "source": [
     "$$corr_{KuhnsII} =\n",
-    "\\frac{2 \\times \\delta(TP + FP, TP + FN)}\n",
+    "\\frac{\\delta(TP + FP, TP + FN)}\n",
     "{\\max(TP + FP, TP + FN)}\n",
     "$$\n",
     "\n",