How did ascrībō ('write') shift to mean figuratively 'impute'?

[12john]

Without explanation, Lewis & Short jumps from

'to annex by writing, to add to a writing'

to

'B. Trop. 1. To impute, ascribe, attribute to one the cause of something'.

Etymonline fails at explanation also. How's 'write' semantically related to 'impute'?

Latin ascribere "to write in, enter in a list; add to in a writing," figuratively "impute, attribute,"
from ad "to" (see [ad-])
+ scriber "to write" (from PIE root [*skribh-] "to cut")