diff --git a/docs/envvars.rst b/docs/envvars.rst
index 234c44ef5e2..041a621c9d3 100644
--- a/docs/envvars.rst
+++ b/docs/envvars.rst
@@ -1588,6 +1588,8 @@ RADV driver environment variables
       disable optimizations that get enabled when all VRAM is CPU visible.
    ``pswave32``
       enable wave32 for pixel shaders (GFX10+)
+   ``rtcps``
+      enable CPS lowering mode instead of function calls for RT
    ``rtwave64``
       enable wave64 for ray tracing shaders (GFX10+)
    ``sam``