diff --git a/doc/items.lua b/doc/items.lua
index abad424..b163cc8 100644
--- a/doc/items.lua
+++ b/doc/items.lua
@@ -110,6 +110,7 @@ techage.Items = {
 	ta3_logic = "techage:ta3_logic",
 	ta3_nodedetector = "techage:ta3_nodedetector_off",
 	ta3_playerdetector = "techage:ta3_playerdetector_off",
+	ta3_lightdetector = "techage:ta3_lightdetector_off",
 	ta3_repeater = "techage:ta3_repeater",
 	ta3_sequencer = "techage:ta3_sequencer",
 	ta3_timer = "techage:ta3_timer",
diff --git a/manuals/manual_ta3_EN.md b/manuals/manual_ta3_EN.md
index b24434c..1226097 100644
--- a/manuals/manual_ta3_EN.md
+++ b/manuals/manual_ta3_EN.md
@@ -730,6 +730,12 @@ If the search should be limited to specific players, these player names can also
 
 [ta3_playerdetector|image]
 
+### TA3 Light Detector
+
+The light detector sends an `on` command if the light level of the block above exceeds a certain level, which can be set through the right-click menu.
+If you have a TA4 Lua Controller, you can get the exact light level with $get_cmd(num, 'light_level')
+
+[ta3_lightdetector|image]
 
 ## TA3 Machines