diff --git a/docs/BIOI611_scRNA_seq_cele_cellranger.ipynb b/docs/BIOI611_scRNA_seq_cele_cellranger.ipynb
index 1e3a4a2..b6a9af1 100644
--- a/docs/BIOI611_scRNA_seq_cele_cellranger.ipynb
+++ b/docs/BIOI611_scRNA_seq_cele_cellranger.ipynb
@@ -4,7 +4,7 @@
   "metadata": {
     "colab": {
       "provenance": [],
-      "authorship_tag": "ABX9TyMFyELCr+oxSe7wC6yZYhmf",
+      "authorship_tag": "ABX9TyMnBOK1zaB4XJp605WWiYHL",
       "include_colab_link": true
     },
     "kernelspec": {
@@ -26,15 +26,6 @@
         "<a href=\"https://colab.research.google.com/github/Bix4UMD/BIOI611_lab/blob/main/docs/BIOI611_scRNA_seq_cele_cellranger.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
       ]
     },
-    {
-      "cell_type": "code",
-      "execution_count": null,
-      "metadata": {
-        "id": "ld1dk0-eu0yH"
-      },
-      "outputs": [],
-      "source": []
-    },
     {
       "cell_type": "markdown",
       "source": [
@@ -49,17 +40,19 @@
         "/scratch/zt1/project/bioi611/shared/raw_data/10x_cele_data/scRNA/\n",
         "\n",
         "\n",
+        "\n",
         "1.   If you want to download and prepare the files yourself,\n",
         "\n",
         "\n",
         "\n",
-        "here is the process:\n",
+        "Here is the process:\n",
         "\n",
         "For each sample, fetch the sra files using `prefectch`\n",
         "\n",
         "For example:\n",
         "\n",
         "```\n",
+        "export PATH=/scratch/zt1/project/bioi611/shared/software/sratoolkit.3.1.1-centos_linux64/bin:$PATH\n",
         "prefetch SRR8611967\n",
         "```\n",
         "\n",
@@ -167,26 +160,6 @@
       "metadata": {
         "id": "JF7K8exAyNry"
       }
-    },
-    {
-      "cell_type": "code",
-      "source": [],
-      "metadata": {
-        "id": "JxBOZbI4xsE4"
-      },
-      "execution_count": null,
-      "outputs": []
-    },
-    {
-      "cell_type": "code",
-      "source": [
-        "\n"
-      ],
-      "metadata": {
-        "id": "EeibAuVev0Na"
-      },
-      "execution_count": null,
-      "outputs": []
     }
   ]
 }
\ No newline at end of file