diff --git a/docs/ch02-start/app-types.md b/docs/ch02-start/app-types.md
index 6564c71f..175744f1 100644
--- a/docs/ch02-start/app-types.md
+++ b/docs/ch02-start/app-types.md
@@ -58,7 +58,7 @@ QString s1("Hello");
 QString s2("Qt");
 // convenient container classes
 QStringList list;
-list <<  s1 << s2;
+list << s1 << s2;
 // join strings
 QString s = list.join(" ") + "!";
 cout << s << Qt::endl;