Question about saving throws

[Archmage1]

I remember reading somewhere that a character knows the outcome of an enemies saves for single target effects, but not for aoe effects. Does anyone remember where that is from?

[BowStreetRunner]

Rules Compendium, page 112.

"...if a creature’s saving throw succeeds against a targeted effect, the effect’s creator senses that the effect has failed. A caster can’t sense when creatures succeed on saves against effect spells or area spells, or against similar abilities."

[Archmage1]

Thank you.