mention four meeting requirement

diff --git a/join.mdwn b/join.mdwn
index 84c2b45f3f555c6d52b9a1fe5047913501986f5c..20658ef7b2ca747a2b448eb6eceaf93968c647f7 100644 (file)
--- a/join.mdwn
+++ b/join.mdwn
@@ -16,7 +16,7 @@ topics technical and otherwise.
 
 Prospective members are encouraged to **hang out around the SIPB office** during
 meetings (they're Mondays at 7:30PM) and at other times (check the door icon on
-[sipb.mit.edu](http://sipb.mit.edu/) to see if the office is open).
+[sipb.mit.edu](http://sipb.mit.edu/) to see if the office is open). (Coming to at least four meetings is required to be membered, though usually this happens before prospectives are otherwise ready to be membered.)
 
 You can also participate in SIPB activities like hackathons,
 [cluedumps](http://cluedumps.mit.edu/), and [IAP