diff --git a/notebooks/trend_changepoints.ipynb b/notebooks/trend_changepoints.ipynb
index aceadd0..bc4a9b7 100644
--- a/notebooks/trend_changepoints.ipynb
+++ b/notebooks/trend_changepoints.ipynb
@@ -134,7 +134,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "The number of potential changepoints can be set using the argument `n_changepoints`, but this is better tuned by adjusting the regularization."
+    "The number of potential changepoints can be set using the argument `n_changepoints`, but this is better tuned by adjusting the regularization.\n",
+    "\n",
+    "By default changepoints are only inferred for the first 80% of the time series in order to have plenty of runway for projecting the trend forward and to avoid overfitting fluctuations at the end of the time series. This default works in many situations but not all, and can be change using the `changepoint_range` argument. For example, `m = Prophet(changepoint_range=0.9)` in Python or `m <- prophet(changepoint.range = 0.9)` in R will place potential changepoints in the first 90% of the time series."
    ]
   },
   {