diff --git a/nlp/4_3_Vector_Representation.ipynb b/nlp/4_3_Vector_Representation.ipynb
index 9eb8e9a..a13ca53 100644
--- a/nlp/4_3_Vector_Representation.ipynb
+++ b/nlp/4_3_Vector_Representation.ipynb
@@ -363,7 +363,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "vectorizer = CountVectorizer(analyzer=\"word\", stop_words='english', ngram_range=[2,2]) \n",
+    "vectorizer = CountVectorizer(analyzer=\"word\", stop_words='english', ngram_range=(2,2)) \n",
     "vectors = vectorizer.fit_transform(documents)\n",
     "vectorizer.get_feature_names_out()"
    ]