diff --git a/notebooks/study.ipynb b/notebooks/study.ipynb
index 7f9183a..be5ee91 100644
--- a/notebooks/study.ipynb
+++ b/notebooks/study.ipynb
@@ -50,16 +50,19 @@
         "pass_test = mdp.new_state(\"pass test\")\n",
         "fail_test = mdp.new_state(\"fail test\")\n",
         "\n",
+        "# From the initial state, you can choose to study, or not to study.\n",
         "init.set_transitions([\n",
         "    (study, studied),\n",
         "    (not_study, not_studied)\n",
         "])\n",
         "\n",
+        "# If you studied, then there is a 90% chance that you pass the test.\n",
         "studied.set_transitions([\n",
         "    (9/10, pass_test),\n",
         "    (1/10, fail_test)\n",
         "])\n",
         "\n",
+        "# If you did not study, then there is only a 40% chance that you pass the test.\n",
         "not_studied.set_transitions([\n",
         "    (4/10, pass_test),\n",
         "    (6/10, fail_test)\n",