diff --git a/Component-Generator.md b/Component-Generator.md
index de0dcee..dd0c84a 100644
--- a/Component-Generator.md
+++ b/Component-Generator.md
@@ -6,6 +6,10 @@ Callbacks:
   The current number of fuel items still in the generator.
 - `insert([count: number]): boolean[, string]`  
   Inserts up to the specified number of fuel items from the currently selected inventory slot into the generator's inventory. Returns `true` if at least one item was moved to the generator's inventory. Returns `false` and an error message otherwise.
+Possible error messages are:
+`"selected slot does not contain fuel"` if the selected slot has no item which can be burnt
+`"different fuel type already queued"` if there is already another type of item in the generator
+`"queue is full"` if there already are 64 items of that type in the generator
 - `remove([count: number]): boolean`  
   Removes up to the specified number of fuel items from the generator and places them into the currently selected slot or the first free slot after it. Returns `true` if at least on item was removed from the generator's inventory, `false` otherwise.