diff --git a/examples/defer/defer.go b/examples/defer/defer.go
index 0eca985..0941d10 100644
--- a/examples/defer/defer.go
+++ b/examples/defer/defer.go
@@ -41,6 +41,7 @@ func writeFile(f *os.File) {
 func closeFile(f *os.File) {
 	fmt.Println("closing")
 	err := f.Close()
+	// It is important to check for errors when closing a file, even in a deferred function.
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "error: %v\n", err)
 		os.Exit(1)