diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index d0eba48dd74e1dc42e07b7e8335e421360fa4421..cf2721a9124974d2a53ac52216d0ade9872404d8 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -186,7 +186,7 @@ module_param_named(dynclks, radeon_dynclks, int, 0444);
 MODULE_PARM_DESC(r4xx_atom, "Enable ATOMBIOS modesetting for R4xx");
 module_param_named(r4xx_atom, radeon_r4xx_atom, int, 0444);
 
-MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing");
+MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
 module_param_named(vramlimit, radeon_vram_limit, int, 0600);
 
 MODULE_PARM_DESC(agpmode, "AGP Mode (-1 == PCI)");