diff --git a/notebooks/asdf_example/asdf_example.ipynb b/notebooks/asdf_example/asdf_example.ipynb
index c88385979..02f1421b9 100644
--- a/notebooks/asdf_example/asdf_example.ipynb
+++ b/notebooks/asdf_example/asdf_example.ipynb
@@ -5,7 +5,7 @@
    "metadata": {},
    "source": [
     "# ASDF Example\n",
-    " \n",
+    "\n",
     "**Use case:** Create ASDF (Advanced Scientific Data Format) file from FITS file.<br>\n",
     "**Data:** CANDELS image of the COSMOS field.<br>\n",
     "**Tools:** asdf, gwcs, astrocut.<br>\n",