diff --git a/include/gsl/gsl b/include/gsl/gsl
index 26742be..7ef7742 100644
--- a/include/gsl/gsl
+++ b/include/gsl/gsl
@@ -24,6 +24,7 @@
 #include <gsl/multi_span>  // multi_span, strided_span...
 #include <gsl/span>        // span
 #include <gsl/string_span> // zstring, string_span, zstring_builder...
+#include <gsl/gsl_thread>  // raii_thread, detached_thread...
 #include <memory>
 #include <iostream>