diff --git a/B03898_06_codes/Chapter 6 Notebook.ipynb b/B03898_06_codes/Chapter 6 Notebook.ipynb
index 050977c..49ea688 100644
--- a/B03898_06_codes/Chapter 6 Notebook.ipynb	
+++ b/B03898_06_codes/Chapter 6 Notebook.ipynb	
@@ -619,9 +619,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "pd.rolling_corr(log_returns['EUROSTOXX'], \n",
-      "                 log_returns['VSTOXX'], \n",
-      "                 window=252).plot(figsize=(10,8))\n",
+      "log_returns['EUROSTOXX'].rolling(252).corr(log_ret['VSTOXX']).plot(figsize=(10,8))"
       "plt.ylabel('Rolling Annual Correlation')"
      ],
      "language": "python",
@@ -1043,4 +1041,4 @@
    "metadata": {}
   }
  ]
-}
\ No newline at end of file
+}