Ignore built site.
diff --git a/.gitignore b/.gitignore
index 8451652..5ec5ed6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,6 +49,7 @@
 MinSizeRel/
 Release/
 RelWithDebInfo/
+doc/html/
 .vs/
 .dirstamp
 *.o