diff --git a/includes/polling/applications/proxmox.inc.php b/includes/polling/applications/proxmox.inc.php
index 878fc67eb8..64668f5263 100644
--- a/includes/polling/applications/proxmox.inc.php
+++ b/includes/polling/applications/proxmox.inc.php
@@ -4,6 +4,13 @@ if (isset($config['enable_proxmox']) && $config['enable_proxmox'] && !empty($age
     $proxmox = $agent_data['app']['proxmox'];
 }
 
+/**
+ * Check if a port on a Proxmox VM exists
+ * @param string  $p Port name
+ * @param string  $c Clustername
+ * @param integer $i VM ID
+ * @return integer|boolean The port-ID if the port exists, false if it doesn't exist
+ */
 function proxmox_port_exists($i, $c, $p) {
     if ($row = dbFetchRow("SELECT pmp.id FROM proxmox_ports pmp, proxmox pm WHERE pm.id = pmp.vm_id AND pmp.port = ? AND pm.cluster = ? AND pm.vmid = ?", array($p, $c, $i))) {
         return $row['id'];
@@ -12,6 +19,13 @@ function proxmox_port_exists($i, $c, $p) {
     return false;
 }
 
+/**
+ * Check if a Proxmox VM exists
+ * @param integer $i VM ID
+ * @param string  $c Clustername
+ * @param array   $pmxcache Reference to the Proxmox VM Cache
+ * @return boolean true if the VM exists, false if it doesn't
+ */
 function proxmox_vm_exists($i, $c, &$pmxcache) {
 
     if (isset($pmxcache[$c][$i]) && $pmxcache[$c][$i] > 0) {