diff --git a/shiny/render/_display.py b/shiny/render/_display.py
index 593cdda4d..3922821a5 100644
--- a/shiny/render/_display.py
+++ b/shiny/render/_display.py
@@ -94,7 +94,7 @@ async def render(self) -> JsonifiableDict | None:
             ret = sync_value_fn()
             if ret is not None:
                 raise RuntimeError(
-                    "@render.display functions should not return values. (`None` is allowed)."
+                    "@render.display functions should not return values. Instead, @render.display dynamically renders every printable line within the function body. (`None` is a valid return value.)"
                 )
         finally:
             sys.displayhook = orig_displayhook