diff --git a/ProcessFASTQ.ipynb b/ProcessFASTQ.ipynb
index 3943225353d510c17aed04324529aa70099979b4..7a78e1cd3aa39a30cf8c354a00fd7a7360713fb3 100644
--- a/ProcessFASTQ.ipynb
+++ b/ProcessFASTQ.ipynb
@@ -683,7 +683,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 240,
+   "execution_count": 242,
    "metadata": {
     "collapsed": false
    },
@@ -722,7 +722,11 @@
     "    #sub_iter = (rec for rec in filt_iter \\\n",
     "    #            if matches.readline().split('\\t')[1] == '4')\n",
     "    \n",
-    "    \n",
+    "    for record in filt_iter:\n",
+    "        arr = matches.readline().split('\\t')\n",
+    "        seq_id = arr[0]\n",
+    "        flag_field = arr[1]\n",
+    "        \n",
     "\n",
     "    # Write back fastq\n",
     "    SeqIO.write(sub_iter,substracted,\"fastq\")"