Update README

diff --git a/README b/README
index c2e6d789a36d747285e33111c1e84a9be084c83c..6073afe93e4277ea2f5a98dc3b0522e5f83ac7bf 100644 (file)
--- a/README
+++ b/README
@@ -237,7 +237,8 @@ waiting for tweets.
 The `block` parameter sets the stream to be fully non-blocking. In
 this mode, the iterator always yields immediately. It returns
 stream data, or `None`. Note that `timeout` supercedes this
-argument, so it should also be set `None` to use this mode.
+argument, so it should also be set `None` to use this mode, 
+and non-blocking can potentially lead to 100% CPU usage.
 
 Twitter Response Objects
 ------------------------