Single chip non-verbal raise?

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Roberts Rules of Poker --

Section 3 -- Betting and Raising (Rule 15).

"15. If you put a single chip in the pot that is larger than the bet , but do not announce a raise , you are assumed to have only called. Example: In a $3-$6 game, when a player bets $6 and the next player puts a $25 chip in the pot without saying anything, that player has merely called the $6 bet ."

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That's the limit rule. The rule is different in No-Limit:

Chapter 14:

11. A bet of a single chip or bill without comment is considered to be the full amount of the chip or bill allowed. However, a player acting on a previous bet with a larger denomination chip or bill is calling the previous bet unless this player makes a verbal declaration to raise the pot. (This includes acting on the forced bet of the big blind .)

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They are both right. If there is a better and you throw a large chip without saying anything it is a Call. If there is no action to you and toy throw in a large chip the bet is the denomination of the large chip. It is called the single chip rule.