diff --git a/README.md b/README.md
index 527000d..ec1d3d2 100644
--- a/README.md
+++ b/README.md
@@ -150,6 +150,7 @@ through.
 - `ephemeral` — send/edit ephemerally
 - `page_text` — format string for the jump button label
 - `emojis` — override navigation emojis
+- `cache_sleep` — seconds to wait after cache-priming before refreshing (default 1.0)
 
 ## Subclassing