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Comprehension is a perk in Fallout 2, Fallout 3, Fallout New Vegas and Fallout Tactics.
Overview
Fallout 2 and Fallout Tactics

Gameplay articles: Fallout 2, Fallout Tactics
Gain 50% more skill points when reading books.
Fallout 3 and Fallout: New Vegas

Gameplay articles: Fallout 3, Fallout: New Vegas
Gain 2 skill points per read book instead of 1.
Fallout: The Roleplaying Game

Gameplay article: Fallout: The Roleplaying Game
Roll 1d6 after using the effect of a magazine to retain it for an additional use.