追加

1. Origins, structure, and basic meaning

• Structure: 追加(ついか) means adding something to what is already there.
• Basic usage: It is used for increasing supplies as participant numbers grow or adding items after placing an order.

2. Common pitfalls and similar expressions

• The number added and the total
  • 椅子を十脚追加した means that ten more chairs were added.
  • It does not mean that there were ten chairs in total after the addition.
• Cases with a charge
  • 料金がかかる場合がある means that a charge applies in some cases; it does not assert that a charge always applies.