diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index b832425eb07..fa59efbcb91 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -4043,6 +4043,7 @@ function &get_mailer($action='get') {
  *
  * @uses $CFG
  * @uses $FULLME
+ * @uses $MNETIDPJUMPURL IdentityProvider(IDP) URL user hits to jump to mnet peer.
  * @uses SITEID
  * @param user $user  A {@link $USER} object
  * @param user $from A {@link $USER} object
@@ -4059,7 +4060,7 @@ function &get_mailer($action='get') {
  */
 function email_to_user($user, $from, $subject, $messagetext, $messagehtml='', $attachment='', $attachname='', $usetrueaddress=true, $replyto='', $replytoname='', $wordwrapwidth=79) {
 
-    global $CFG, $FULLME, $IDPJUMPURL;
+    global $CFG, $FULLME, $MNETIDPJUMPURL;
     static $mnetjumps = array();
 
     if (empty($user)) {
@@ -4092,12 +4093,12 @@ function email_to_user($user, $from, $subject, $messagetext, $messagehtml='', $a
         require_once($CFG->dirroot.'/mnet/lib.php');
         // Form the request url to hit the idp's jump.php
         if (isset($mnetjumps[$user->mnethostid])) {
-            $IDPJUMPURL = $mnetjumps[$user->mnethostid];
+            $MNETIDPJUMPURL = $mnetjumps[$user->mnethostid];
         } else {
             $idp = mnet_get_peer_host($user->mnethostid);
             $idpjumppath = '/auth/mnet/jump.php';
-            $IDPJUMPURL = $idp->wwwroot . $idpjumppath . '?hostwwwroot=' . $CFG->wwwroot . '&wantsurl=';
-            $mnetjumps[$user->mnethostid] = $IDPJUMPURL;
+            $MNETIDPJUMPURL = $idp->wwwroot . $idpjumppath . '?hostwwwroot=' . $CFG->wwwroot . '&wantsurl=';
+            $mnetjumps[$user->mnethostid] = $MNETIDPJUMPURL;
         }
 
         $messagetext = preg_replace_callback("%($CFG->wwwroot[^[:space:]]*)%",
diff --git a/mnet/lib.php b/mnet/lib.php
index 3aa0b90debc..35cbb358559 100644
--- a/mnet/lib.php
+++ b/mnet/lib.php
@@ -548,14 +548,22 @@ function mnet_get_peer_host ($mnethostid) {
  * log in at their mnet identity provider (if they are not already logged in)
  * before ultimately being directed to the original url.
  *
- * uses global IDPJUMPURL - the url which user should initially be directed to
+ * uses global MNETIDPJUMPURL the url which user should initially be directed to
+ *     MNETIDPJUMPURL is a URL associated with a moodle networking peer when it
+ *     is fulfiling a role as an identity provider (IDP). Different urls for
+ *     different peers, the jumpurl is formed partly from the IDP's webroot, and
+ *     partly from a predefined local path within that webwroot.
+ *     The result of the user hitting MNETIDPJUMPURL is that they will be asked
+ *     to login (at their identity provider (if they aren't already)), mnet
+ *     will prepare the necessary authentication information, then redirect
+ *     them back to somewhere at the content provider(CP) moodle (this moodle)
  * @param array $url array with 2 elements
  *     0 - context the url was taken from, possibly just the url, possibly href="url"
  *     1 - the destination url
  * @return string the url the remote user should be supplied with.
  */
 function mnet_sso_apply_indirection ($url) {
-    global $IDPJUMPURL;
+    global $MNETIDPJUMPURL;
 
     $localpart='';
     $urlparts = parse_url($url[1]);
@@ -570,7 +578,7 @@ function mnet_sso_apply_indirection ($url) {
             $localpart .= '#'.$urlparts['fragment'];
         }
     }
-    $indirecturl = $IDPJUMPURL . urlencode($localpart);
+    $indirecturl = $MNETIDPJUMPURL . urlencode($localpart);
     //If we matched on more than just a url (ie an html link), return the url to an href format
     if ($url[0] != $url[1]) {
         $indirecturl = 'href="'.$indirecturl.'"';