--- a/GearTypes.wiki	Mon Mar 21 00:50:27 2016 +0000
+++ b/GearTypes.wiki	Mon Mar 21 01:20:22 2016 +0000
@@ -28,7 +28,7 @@
 
 === Utilities ===
 || *Gear type* || *Description* ||
-|| `gtGirder` || A construction or rubber ||
+|| `gtGirder` || An attempt to place a construction or rubber ||
 || `gtJetpack` || A flying saucer ||
 || `gtLandGun` || The land spray tool ||
 || `gtParachute` || A parachute ||
@@ -168,8 +168,11 @@
 The gears used by various utilities.
 
 ==== `gtGirder` ====
-A construction or rubber.
-TODO
+This gear is created when a player tried to place construction or rubber somewhere which may or may not have been successful.
+
+ * `State`: Orientation and size coded as a number. See Lua API documentation on `onGirderPlacement` or `onRubberPlacement` for the meaning of the number
+
+If you expect a successful placement including information regarding building type, position and orientation, use the functions `onGirderPlacement` and `onRubberPlacement`, respectively.
 
 ==== `gtJetpack` ====
 A flying saucer. Its fuel is stored in `Health` and starts at 2000, which stands for 100% fuel. The fuel value is reduced whenever the player taps one of the direction keys. The up direction costs 50 fuel and the left and right directions cost 10 fuel.