diff --git a/OpenSim/Region/Framework/Interfaces/INPCModule.cs b/OpenSim/Region/Framework/Interfaces/INPCModule.cs
index d5dcdddf6a..478833ea70 100644
--- a/OpenSim/Region/Framework/Interfaces/INPCModule.cs
+++ b/OpenSim/Region/Framework/Interfaces/INPCModule.cs
@@ -122,6 +122,17 @@ namespace OpenSim.Region.Framework.Interfaces
         /// <summary>
         /// Check if the caller has permission to manipulate the given NPC.
         /// </summary>
+        /// <remarks>
+        /// A caller has permission if
+        ///   * An NPC exists with the given npcID.
+        ///   * The caller UUID given is UUID.Zero.
+        ///   * The avatar is unowned (owner is UUID.Zero).
+        ///   * The avatar is owned and the owner and callerID match.
+        ///   * The avatar is owned and the callerID matches its agentID.
+        /// </remarks>
+        /// <param name="av"></param>
+        /// <param name="callerID"></param>
+        /// <returns>true if they do, false if they don't.</returns>
         /// <param name="npcID"></param>
         /// <param name="callerID"></param>
         /// <returns>
diff --git a/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs b/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
index 95e59ab38e..b834619d2c 100644
--- a/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
+++ b/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
@@ -441,13 +441,20 @@ namespace OpenSim.Region.OptionalModules.World.NPC
         /// <summary>
         /// Check if the caller has permission to manipulate the given NPC.
         /// </summary>
+        /// <remarks>
+        /// A caller has permission if
+        ///   * The caller UUID given is UUID.Zero.
+        ///   * The avatar is unowned (owner is UUID.Zero).
+        ///   * The avatar is owned and the owner and callerID match.
+        ///   * The avatar is owned and the callerID matches its agentID.
+        /// </remarks>
         /// <param name="av"></param>
         /// <param name="callerID"></param>
         /// <returns>true if they do, false if they don't.</returns>
         private bool CheckPermissions(NPCAvatar av, UUID callerID)
         {
             return callerID == UUID.Zero || av.OwnerID == UUID.Zero ||
-                    av.OwnerID == callerID;
+                av.OwnerID == callerID  || av.AgentId == callerID;
         }
     }
 }
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