diff --git a/Appendix-D-HInfinity-Filters.ipynb b/Appendix-D-HInfinity-Filters.ipynb
index 1942ea1..9aefffd 100644
--- a/Appendix-D-HInfinity-Filters.ipynb
+++ b/Appendix-D-HInfinity-Filters.ipynb
@@ -269,7 +269,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "I am still mulling over how to write this chapter. In the meantime, Professor Dan Simon at Clevant State University has an accessible introduction here:\n",
+    "I am still mulling over how to write this chapter. In the meantime, Professor Dan Simon at Cleveland State University has an accessible introduction here:\n",
     "\n",
     "http://academic.csuohio.edu/simond/courses/eec641/hinfinity.pdf\n",
     "\n",