diff --git a/06_classifiers_overview-part_2.ipynb b/06_classifiers_overview-part_2.ipynb
index a9ef1358d1154c11aed955aff3a65a931d912b02..ad722359bcef8e2cb87cefe18f5dcdd5e835783a 100644
--- a/06_classifiers_overview-part_2.ipynb
+++ b/06_classifiers_overview-part_2.ipynb
@@ -65113,6 +65113,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "About the plot: **the points surrounded with a circle are from the test data set** (not used for learning), all other points belong to the training data.\n",
+    "\n",
     "This surface seems a bit rough on edges. One of the biggest advantages of the decision trees is interpretability of the model. Let's **inspect the model by looking at the tree that was built**:"
    ]
   },
@@ -69038,7 +69040,7 @@
     "* maximum tree depth (`max_depth`), or\n",
     "* a minimum number of samples required at a node or at a leaf node (`min_samples_split`, `min_samples_leaf`), or\n",
     "* an early stopping criteria based on minumum value of impurity or on minimum decrease in impurity (`min_impurity_split`, `min_impurity_decrease`),\n",
-    "* ... and some more (see docs).\n"
+    "* ... and few more - see `DecisionTreeClassifier` docs.\n"
    ]
   },
   {