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From The Vault - Fallout Wiki
You pay much closer attention to the smaller details when reading. You gain 50% more skill points when reading books.
”— in-game description, Fallout 2
Comprehension is a perk in Fallout 2, Fallout Tactics, Fallout 3, and Fallout: New Vegas and J.E. Sawyer's Fallout Role-Playing Game.
Fallout 2 and Fallout Tactics[edit | edit source]
Grants a 50% bonus to skill points gained from reading books. The perk is a waste of a slot, since all skill books cease to have an effect upon reaching 91% (not to mention, Awareness is available at the same level).
Doubles the amount of skill points gained from reading skill books (+2 instead of +1). Obviously, the perk only affects skill books read after selecting the perk.
With a total of 324 skill books in Fallout 3 (not including add-ons), this nets a total of 324 extra skill points if the perk is taken prior to reading any skill book, for a total of 648. If the bugged respawning books are used, this perk allows for an effectively infinite source of skill books for Science and Big Guns skills (from Big Book of Science from the Ant Researcher in Shalebridge and the U.S. Army: 30 Handy Flamethrower Recipes from a raider using a flamer in Bethesda Office East).
With the Comprehension perk, you gain double the bonus from reading magazines and one additional point from skill books.
”— In-game description, Fallout: New Vegas
The perk doubles the skill boost provided by magazines (from +10 to +20) and increases the effectiveness of book by 33% (from +3 to +4 skill points). This translates to 52 extra skill points in base New Vegas and 46 in the add-ons. The latter number may vary depending on the luck with Workbench crates in Honest Hearts.
J.E. Sawyer's Fallout Role-Playing Game[edit | edit source]
You pay much closer attention to details when you are reading. You gain 50% more skill points when reading skill-increasing books.
The player gains +50% points from reading skill books.