Clarify how pagination works for /users.

GithubGeekJoelLOL · GithubGeekJoelLOL · commit 542b7b6a0559 · 2013-06-07T17:03:56.000-06:00
diff --git a/content/v3/users.md b/content/v3/users.md
@@ -76,7 +76,8 @@ bio
 ## Get all users
 
 This provides a dump of every user, in the order that they signed up for
-GitHub.
+GitHub. Note that the `since` parameter is required in addition to the
+`page` parameter when using pagination.
 
     GET /users
 
