diff --git a/README.md b/README.md
index 652b58e2c7c285b32310b035b846eeb393c73c78..ebd8918308947be68b114e8e2b0c5bb7d71175f1 100644
--- a/README.md
+++ b/README.md
@@ -39,30 +39,38 @@ The plugin creates the service **_Squid_** the items _**Client**_, _**Server**_,
 
 <details><summary>Montoring states</summary>
 
-| State     | Counter           | condition     | WATO   |
-| -----     | -----             |------         | ------ |
-| WARN/CRIT | Client Requests   | not in levels | yes    |
-| WARN/CRIT | Client Hits       | not in levels | yes    |
-| WARN/CRIT | Server Requests   | not in levels | yes    |
-| WARN/CRIT | CPU Usage         | not in levels | yes    |
-| WARN/CRIT | DNS response time | not in levels | yes    |
+| State     | Counter                    | condition     | WATO   |
+| -----     | -----                      |------         | ------ |
+| WARN/CRIT | Client Requests            | not in levels | yes    |
+| WARN/CRIT | Client Hits                | not in levels | yes    |
+| WARN/CRIT | Server Requests            | not in levels | yes    |
+| WARN/CRIT | CPU Usage                  | not in levels | yes    |
+| WARN/CRIT | DNS response time          | not in levels | yes    |
+| WARN/CRIT | File descriptors available | not in levels | yes    |
+
 
 </details>
 
 <details><summary>Perfdata</summary>
 
-| Metric              | Unit    | Perfometer |
-| ------              | ------  | ------     |
-| Client requests     | 1/s     | no         |
-| Client errors       | 1/s     | no         |
-| Client hits         | 1/s     | no         |
-| Client bytes in/out | bit/s   | yes        |
-| Server requests     | 1/s     | no         |
-| Server errors       | 1/s     | no         |
-| Server bytes in/out | bit/s   | yes        |
-| CPU utilization     | %       | yes        |
-| CPU time            | seconds | no         |
-| DNS response time   | seconds | yes        |
+| Metric                     | Unit    | Perfometer |
+| ------                     | ------  | ------     |
+| Client requests            | 1/s     | no         |
+| Client errors              | 1/s     | no         |
+| Client hits                | 1/s     | no         |
+| Client bytes in/out        | bit/s   | yes        |
+| Server requests            | 1/s     | no         |
+| Server errors              | 1/s     | no         |
+| Server bytes in/out        | bit/s   | yes        |
+| CPU utilization            | %       | yes        |
+| CPU time                   | seconds | no         |
+| DNS response time          | seconds | yes        |
+| SWAP in/out                | 1/s     | no         |
+| SWAP Files cleaned         | 1/s     | no         |
+| File descriptors Maximum   | count   | no         |
+| File descriptors Available | count   | yes        |
+| File descriptors Reserved  | count   | no         |
+
 
 </details>
 
@@ -74,13 +82,14 @@ The plugin creates the service **_Squid_** the items _**Client**_, _**Server**_,
 | ------                             | ------          |
 | Applications, Processes & Services | Squid Web Proxy |
 
-| Option                           | Defailt value | Predictive | 
-| ------                           | ------        | ---------- |
-| Set levels for Client Requests   | none          | optional   |
-| Set levels for Client Hits       | none          | optional   |
-| Set levels for Server Requests   | none          | optional   |
-| Set levels for Squid CPU usage   | 60.0/80.0     | optional   |
-| Set levels for DNS response time | 2.0/4.0       | no         |
+| Option                                    | Defailt value | Predictive | 
+| ------                                    | ------        | ---------- |
+| Set levels for Client Requests            | none          | optional   |
+| Set levels for Client Hits                | none          | optional   |
+| Set levels for Server Requests            | none          | optional   |
+| Set levels for Squid CPU usage            | 60.0/80.0     | optional   |
+| Set levels for DNS response time          | 2.0/4.0       | no         |
+| Set levels for available file descriptors | none          | optional   |
 
 </details> 
 
@@ -90,9 +99,10 @@ The plugin creates the service **_Squid_** the items _**Client**_, _**Server**_,
 | ------      | ------                  |
 | Agent rules | Squid Web Proxy (Linux) |
 
-| Option      | Defailt value |
-| ------      | ------        |
-| Port number | 3128          |
+| Option              | Defailt value |
+| ------              | ------        |
+| IP Address/Hostname | localhost     |
+| Port number         | 3128          |
 
 </details>