diff --git a/docs/qbsp.rst b/docs/qbsp.rst
index 1fc94add..865a58a7 100644
--- a/docs/qbsp.rst
+++ b/docs/qbsp.rst
@@ -192,6 +192,11 @@ Options
 
    Emit skip/nodraw faces. Mainly for Q2RTX.
 
+.. option:: -threads n
+
+   Set number of threads to use. By default, qbsp will attempt to
+   use all available hardware threads.
+
 Special Texture Names
 ---------------------