diff --git a/Preface.ipynb b/Preface.ipynb
index 1236c36..632c4b7 100644
--- a/Preface.ipynb
+++ b/Preface.ipynb
@@ -1,7 +1,7 @@
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+  "signature": "sha256:c4084a00cf2f80c65a3076d8f0c1869b6306d5b9b381ab7361f0c2dbea37a240"
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@@ -271,7 +271,7 @@
      "source": [
       "Introductory textbook for Kalman filters and Bayesian filters. All code is written in Python, and the book itself is written in Ipython Notebook so that you can run and modify the code in the book in place, seeing the results inside the book. What better way to learn?\n",
       "\n",
-      "<img src=\"https://raw.githubusercontent.com/rlabbe/Kalman-and-Bayesian-Filters-in-Python/master/Chapter05_Kalman_Filters/dog_track.gif\">\n"
+      "<img src=\"https://raw.githubusercontent.com/rlabbe/Kalman-and-Bayesian-Filters-in-Python/master/05_Kalman_Filters/dog_track.gif\">\n"
      ]
     },
     {