diff --git a/Notebooks/Chap17/17_3_Importance_Sampling.ipynb b/Notebooks/Chap17/17_3_Importance_Sampling.ipynb
index 05b98ca..8f31414 100644
--- a/Notebooks/Chap17/17_3_Importance_Sampling.ipynb
+++ b/Notebooks/Chap17/17_3_Importance_Sampling.ipynb
@@ -387,7 +387,7 @@
         "def compute_expectation2b(n_samples):\n",
         "  # TODO -- complete this function\n",
         "  # 1. Draw n_samples from auxiliary distribution\n",
-        "  # 2. Compute f[y] for those samples\n",
+        "  # 2. Compute f2[y] for those samples\n",
         "  # 3. Scale the results by pr_y / q_y\n",
         "  # 4. Compute the mean of these weighted samples\n",
         "  # Replace this line\n",