diff --git a/02-Discrete-Bayes.ipynb b/02-Discrete-Bayes.ipynb
index 6d81588..576c76b 100644
--- a/02-Discrete-Bayes.ipynb
+++ b/02-Discrete-Bayes.ipynb
@@ -602,17 +602,17 @@
     "from ipywidgets import interact, IntSlider\n",
     "\n",
     "belief = np.array([.35, .1, .2, .3, 0, 0, 0, 0, 0, .05])\n",
-    "beliefs = []\n",
+    "perfect_beliefs = []\n",
     "\n",
     "for _ in range(20):\n",
     "    # Simon takes one step to the right\n",
     "    belief = perfect_predict(belief, 1)\n",
-    "    beliefs.append(belief)\n",
+    "    perfect_beliefs.append(belief)\n",
     "\n",
     "def simulate(time_step):\n",
-    "    book_plots.bar_plot(beliefs[time_step], ylim=(0, .4))\n",
+    "    book_plots.bar_plot(perfect_beliefs[time_step], ylim=(0, .4))\n",
     "    \n",
-    "interact(simulate, time_step=IntSlider(value=0, max=len(beliefs)-1));"
+    "interact(simulate, time_step=IntSlider(value=0, max=len(perfect_beliefs)-1));"
    ]
   },
   {
@@ -778,20 +778,20 @@
    ],
    "source": [
     "belief = np.array([1.0, 0, 0, 0, 0, 0, 0, 0, 0, 0])\n",
-    "beliefs = []\n",
+    "predict_beliefs = []\n",
     "    \n",
     "for i in range(100):\n",
     "    belief = predict_move(belief, 1, .1, .8, .1)\n",
-    "    beliefs.append(belief)\n",
+    "    predict_beliefs.append(belief)\n",
     "\n",
     "print('Final Belief:', belief)\n",
     "\n",
     "# make interactive plot\n",
     "def show_prior(step):\n",
-    "    book_plots.bar_plot(beliefs[step-1])\n",
+    "    book_plots.bar_plot(predict_beliefs[step-1])\n",
     "    plt.title('Step {}'.format(step))\n",
     "\n",
-    "interact(show_prior, step=IntSlider(value=1, max=len(beliefs)));"
+    "interact(show_prior, step=IntSlider(value=1, max=len(predict_beliefs)));"
    ]
   },
   {