More precise description of node_id in mapper_quickstart

examples/mapper_quickstart.ipynb

@@ -359,7 +359,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Here `node_id` is an identifier used to construct the graph, while `pullback_set_label` and `partial_cluster_label` refer to the interval and cluster sets described above. The `node_elements` refers to the indices of our original data that belong to each node. For example, to find which points belong to the first node of the graph we can access the desired data as follows:"
+    "Here `node_id` is a globally unique node identifier used to construct the graph, while `pullback_set_label` and `partial_cluster_label` refer to the interval and cluster sets described above. The `node_elements` refers to the indices of our original data that belong to each node. For example, to find which points belong to the first node of the graph we can access the desired data as follows:"
    ]
   },
   {