diff --git a/Signs.md b/Signs.md
index 24b6d3d..4eea39f 100644
--- a/Signs.md
+++ b/Signs.md
@@ -112,10 +112,53 @@ Creates a mob spawn point.
     <td>1</td><th>[Mob]</th><td></td>
   </tr>
   <tr>
-    <td>2</td><th>Type</th><td>The type of the Mob. You can use custom mobs from the dungeonconfig.</td>
+    <td>2</td><th>Type</th><td>The type of the Mob. You can use custom mobs from the floor config.
+  <tr>
+  <td>3</td><th>delay,count</th><td>The Delay determines how long it takes for the next mob to spawn (in sec.). The Count determines how many mobs are spawned altogether.</td>
+  </tr>
+  <td>4</td><th>Trigger</th><td></td>
+  </tr>
+</table>
+
+***
+
+### ExternalMob
+
+Creates a mob spawn point like the mob sign, but you can use mobs provided by external plugins. DungeonsXL provides built-in support for InsaneMobs, MythicMobs, CustomMobs and Citizens.
+
+<table>
+  <tr>
+    <th>Plugin</th>
+    <th>Provider tag</th>
   </tr>
   <tr>
-  <td>3</td><th>Delay,Count</th><td>The Delay determines, how long it takes for the next mob to spawn (in sec.). The Count determines, how many mobs are spawned altogether.</td>
+    <td>Citizens</td>
+    <td>CI</td>
+  </tr>
+  <tr>
+    <td>CustomMobs</td>
+    <td>CM</td>
+  </tr>
+  <tr>
+    <td>InsaneMobs</td>
+    <td>IM</td>
+  </tr>
+  <tr>
+    <td>MythicMobs</td>
+    <td>MM</td>
+  </tr>
+</table>
+
+You can also add other custom mob plugins if they provide a spawn command with a mob identifier and a location (world name and coordinates) in the [main configuration](main-configuration).
+
+<table>
+  <tr>
+    <td>1</td><th>[ExternalMob]</th><td></td>
+  </tr>
+  <tr>
+    <td>2</td><th>Type</th><td>The identifier of the Mob, e.g. the name or in the case of Citizens the numeric ID.
+  <tr>
+  <td>3</td><th>delay,count,provider</th><td>The additional provider variable can be a value from the table above.</td>
   </tr>
   <td>4</td><th>Trigger</th><td></td>
   </tr>