diff --git a/INSTALL b/INSTALL
index fc8aa268e10f..b5ec62dcefa6 100644
--- a/INSTALL
+++ b/INSTALL
@@ -28,6 +28,7 @@ order to build Wesnoth:
    * Asio                      >= 1.36.0 (header only)
    * Program Options           >= 1.36.0
    * System                    >= 1.36.0
+   * Thread                    >= 1.36.0
  * SDL2 libraries:
    * SDL2                      >= 2.0.2 (2.0.4 on Windows and OS X)
    * SDL2_image                >= 2.0.0 (with PNG and JPEG support)