diff --git a/2-svd-nmf-topic-modeling.ipynb b/2-svd-nmf-topic-modeling.ipynb
index f9d50bf..c87fc38 100644
--- a/2-svd-nmf-topic-modeling.ipynb
+++ b/2-svd-nmf-topic-modeling.ipynb
@@ -569,7 +569,10 @@
    "outputs": [],
    "source": [
     "from spacy.lemmatizer import Lemmatizer\n",
-    "lemmatizer = Lemmatizer()"
+    "from spacy.lookups import Lookups\n",
+    "lookups = Lookups()\n",
+    "lookups.add_table(\"lemma_rules\", {\"noun\": [[\"s\", \"\"]]})\n",
+    "lemmatizer = Lemmatizer(lookups)"
    ]
   },
   {
@@ -1761,4 +1764,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 2
-}
+}
\ No newline at end of file