diff --git a/Makefile b/Makefile
index afdffcb..e147140 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,7 @@ SRCFILES=admin/common.inc.php,admin/directories.php,admin/getgroups.php,admin/in
 
 apidoc:
 	if [ -d apidoc ]; then rm -r apidoc; fi
-	phpdoc -f $(SRCFILES) -t apidoc -s
+	phpdoc -f $(SRCFILES) -t apidoc --undocumentedelements on -s
 
 clean:
 	find -name '*~' -type f -exec rm {} \;
diff --git a/admin/users.php b/admin/users.php
index c5056f3..6e2bc28 100644
--- a/admin/users.php
+++ b/admin/users.php
@@ -30,7 +30,14 @@
 /** Include common code. */
 include_once('common.inc.php');
 
-function getGroups($username) {
+/**
+ * Gets the names of the given users's groups from the group file.
+ *
+ * @param string $username user name
+ * @return array of group names
+ * @access private
+ */
+function _getGroupNames($username) {
   $groupdata = file($GLOBALS['davconfig']['group.file']);
   $retval = array();
   foreach ($groupdata as $line) {
@@ -58,7 +65,7 @@ function getUserData($uid) {
   }
 
   $row = $GLOBALS['namemap'][$uid];
-  $groups = getGroups($row['username']);
+  $groups = _getGroupNames($row['username']);
   $retval = sprintf('<?xml version="1.0" encoding="utf8"?><userdata><uid>%d</uid><username>%s</username><firstname>%s</firstname><lastname>%s</lastname><groups>%s</groups><loggedin>0</loggedin></userdata>',
                     $uid, $row['username'], $row['firstname'],
                     $row['lastname'], implode(", ", $groups));
@@ -121,7 +128,7 @@ function validateUserData(&$userdata, $forinsert) {
 }
 
 /**
- * Creates an entry for a digest authentication file.
+ * Create an entry for a digest authentication file.
  *
  * @param string $username user name
  * @param string $realm realm name
@@ -133,12 +140,20 @@ function createDigest($username, $realm, $password) {
          md5(sprintf("%s:%s:%s", $username, $realm, $password)));
 }
 
+/**
+ * Update the user to name mapping file.
+ */
 function updateNameMap() {
   $fh = fopen($GLOBALS['davconfig']['namemap.file'], 'w');
   fwrite($fh, json_encode($GLOBALS['namemap']));
   fclose($fh);
 }
 
+/**
+ * Update the digest file with the user information.
+ *
+ * @param &array reference to an associative array of user data
+ */
 function updateDigest(&$userdata) {
   if ($userdata['password']) {
     $digests = file($GLOBALS['davconfig']['digest.file']);
@@ -165,6 +180,11 @@ function updateDigest(&$userdata) {
   }
 }
 
+/**
+ * Update the group file with the group assignments of the user.
+ *
+ * @param &array reference to an associative array of user data
+ */
 function updateGroups(&$userdata) {
   if ($userdata['groups']) {
     $written = array();
@@ -255,6 +275,11 @@ function insertUser(&$userdata) {
   return $uid;
 }
 
+/**
+ * Remove the digest entries of the given user from the digest file.
+ *
+ * @param string $username
+ */
 function removeDigest($username) {
   $digests = file($GLOBALS['davconfig']['digest.file']);
   $fh = fopen($GLOBALS['davconfig']['digest.file'], 'w');
@@ -268,6 +293,11 @@ function removeDigest($username) {
   fclose($fh);
 }
 
+/**
+ * Remove the given user from all groups in the group file.
+ *
+ * @param string $username
+ */
 function removeFromGroups($username) {
   $groupdata = file($GLOBALS['davconfig']['group.file']);
   $fh = fopen($GLOBALS['davconfig']['group.file'], 'w');