When the end rhyme changes, the line is given a new

When the end rhyme changes, the line is given a new scheme.

Explanation:

A rhyme scheme is a specific form of metric notation that describes the sequence of rhymes in an abstract form, that is, the sequence and type of correspondence in a stanza or poem.

Thus, if in a poem the sentences end in a certain letter or group of letters, the sound of which is pronounced in a similar way generating a rhyme, that set of sentences is part of the same rhyme scheme. By cutting that rhyme, and changing the ending letter or letters to follow this pattern, the rhyming scheme is being changed for a new one.