diff --git a/gtsam/nonlinear/doc/NonlinearOptimizer.ipynb b/gtsam/nonlinear/doc/NonlinearOptimizer.ipynb
index 84c9283a9..135cc42f1 100644
--- a/gtsam/nonlinear/doc/NonlinearOptimizer.ipynb
+++ b/gtsam/nonlinear/doc/NonlinearOptimizer.ipynb
@@ -39,7 +39,14 @@
     "\n",
     "## Usage\n",
     "\n",
-    "The `NonlinearOptimizer` class is typically not used directly. Instead, one of its derived classes, such as `GaussNewtonOptimizer`, `LevenbergMarquardtOptimizer`, or `DoglegOptimizer`, is used to perform specific types of optimization. These derived classes implement the `optimize()` method according to their respective algorithms."
+    "The `NonlinearOptimizer` class is typically not used directly. Instead, one of its derived classes, such as `GaussNewtonOptimizer`, `LevenbergMarquardtOptimizer`, or `DoglegOptimizer`, is used to perform specific types of optimization. These derived classes implement the `optimize()` method according to their respective algorithms.\n",
+    "\n",
+    "## Files\n",
+    "\n",
+    "- [NonlinearOptimizer.h](https://github.com/borglab/gtsam/blob/develop/gtsam/nonlinear/NonlinearOptimizer.h)\n",
+    "- [NonlinearOptimizer.cpp](https://github.com/borglab/gtsam/blob/develop/gtsam/nonlinear/NonlinearOptimizer.cpp)\n",
+    "- [NonlinearOptimizerParams.h](https://github.com/borglab/gtsam/blob/develop/gtsam/nonlinear/NonlinearOptimizerParams.h)\n",
+    "- [NonlinearOptimizerParams.cpp](https://github.com/borglab/gtsam/blob/develop/gtsam/nonlinear/NonlinearOptimizerParams.cpp)"
    ]
   }
  ],