diff --git a/content/4_Gold/TopoSort.mdx b/content/4_Gold/TopoSort.mdx
index b7abe74..470e6a2 100644
--- a/content/4_Gold/TopoSort.mdx
+++ b/content/4_Gold/TopoSort.mdx
@@ -136,7 +136,7 @@ void compute() {
 
 }
 
-int main() {
+int main() { //See "Intro - Fast I/O" for more information about the first two lines in the main function
 	ios_base::sync_with_stdio(false);
 	cin.tie(NULL);