diff --git a/examples/nblibrary/atm/nmse_PSL.ipynb b/examples/nblibrary/atm/nmse_PSL.ipynb
index 2c4ac165..625e0b37 100644
--- a/examples/nblibrary/atm/nmse_PSL.ipynb
+++ b/examples/nblibrary/atm/nmse_PSL.ipynb
@@ -235,7 +235,7 @@
    },
    "outputs": [],
    "source": [
-    "print('moving on to compute the nmse')\n",
+    "print(\"moving on to compute the nmse\")\n",
     "nmse_dat = []\n",
     "nmse_cesm2 = []\n",
     "nmse_cmip6 = []\n",