diff --git a/Assets/SteamVR/Input/SteamVR_Input_Sources.cs b/Assets/SteamVR/Input/SteamVR_Input_Sources.cs
index 8b61fd88..7485aa76 100644
--- a/Assets/SteamVR/Input/SteamVR_Input_Sources.cs
+++ b/Assets/SteamVR/Input/SteamVR_Input_Sources.cs
@@ -51,6 +51,18 @@ public enum SteamVR_Input_Sources
 
         [Description("/user/treadmill")]
         Treadmill,
+        
+        [Description("/user/knee/left")]
+        LeftKnee,
+
+        [Description("/user/knee/right")]
+        RightKnee,
+
+        [Description("/user/elbow/left")]
+        LeftElbow,
+
+        [Description("/user/elbow/right")]
+        RightElbow,
     }
 }