diff --git a/moldesign/_notebooks/Example 3. Simulating a crystal structure.ipynb b/moldesign/_notebooks/Example 3. Simulating a crystal structure.ipynb
index 07c9a7c..2f19f7c 100644
--- a/moldesign/_notebooks/Example 3. Simulating a crystal structure.ipynb	
+++ b/moldesign/_notebooks/Example 3. Simulating a crystal structure.ipynb	
@@ -11,7 +11,7 @@
     "<a href=\"http://bionano.autodesk.com/MolecularDesignToolkit/explore.html\" target=\"_blank\" title=\"Tutorials\">Tutorials</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\n",
     "<a href=\"http://autodesk.github.io/molecular-design-toolkit/\" target=\"_blank\" title=\"Documentation\">Documentation</a></span>\n",
     "</span>\n",
-    "![Molecular Design Toolkit](img/top.png)\n",
+    "![Molecular Design Toolkit](img/Top.png)\n",
     "<br>\n",
     "<center><h1>Example 3: Simulating a Holliday Junction PDB assembly </h2> </center>\n",
     "\n",
@@ -419,4 +419,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 0
-}
\ No newline at end of file
+}