Update SUMMARY.md

AJ Robertson · AJ Robertson · commit f492b5a5eba6 · 2016-05-18T13:05:23.000-07:00
diff --git a/SUMMARY.md b/SUMMARY.md
@@ -1,5 +1,5 @@
 # Summary
 
 * [Introduction](README.md)
-* [First Chapter](chapter1.md)
+* [OS X](chapter1.md)
 
