diff --git a/notebooks/Determinantal Point Process.ipynb b/notebooks/Determinantal Point Process.ipynb
index 4aa8473..7489fc2 100644
--- a/notebooks/Determinantal Point Process.ipynb	
+++ b/notebooks/Determinantal Point Process.ipynb	
@@ -2629,6 +2629,36 @@
    "source": [
     "# Bernoulli sampleis λ/(λ+1) for including 1/(λ+1) omitting"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 207,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "3×3 Array{Float64,2}:\n",
+       "  0.996704   -0.00697129   0.0330472\n",
+       " -0.027728   -0.220026    -0.707601 \n",
+       " -0.0762402  -0.0111153    0.689383 "
+      ]
+     },
+     "execution_count": 207,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "sum( det(Q[Y,1:3]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {