What is Lincoln 10% plan?

http://www.sparknotes.com/history/american/reconstruction/section1.rhtml

Can you explain what it means please

What part of this don't you understand?

"Lincoln’s blueprint for Reconstruction included the Ten-Percent Plan, which specified that a southern state could be readmitted into the Union once 10 percent of its voters (from the voter rolls for the election of 1860) swore an oath of allegiance to the Union."

The Lincoln 10% Plan refers to a proposal presented by President Abraham Lincoln during the American Civil War. It was a plan for the reconstruction of the Confederate states that had seceded from the Union.

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By following these steps, you can gain a deeper understanding of the Lincoln 10% Plan and its significance in American history.