Comprehension (Fallout Supplement)
From D&D Wiki
You pay much closer attention to the smaller details when reading.
Prerequisite: Level 4, Intelligence 14
Benefit: With the Comprehension feat, you gain one additional point from skill books as well as a +2 to your roll to learn from the book.
Normal: You normally only gain one skill point from reading a book if you make the learning roll.
Special: You may take this feat a second time giving you a +4 to you roll to learn from a book. Also you may attempt to learn from a book that you have previously failed to garner knowledge from or if you have this feat prior to reading a book you may make two attempts to learn. You still only gain the bonus once.