diff --git a/README.txt b/README.txt
index 9830e3f..f329dec 100644
--- a/README.txt
+++ b/README.txt
@@ -113,6 +113,9 @@ R
 l
     Reload shader (if you're using a system without inotify, or inotify fails)
 
+Space
+    Pause/continue
+
 Page up/down
     Modify param0