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5.7.1 Format of the Personal Dictionary
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The personal dictionary generally has a filename of the form:

.aspell.LANG.pws

And the file itself contains two parts. The first part is a header line
of the form:

personal_ws-1.1 LANG NUM [ENCODING]

where NUM is the number of words in the list. This number is only used
as a hint, and thus does not have to be accurate. When creating a new
dictionary it is perfectly acceptable for NUM to be 0. The ENCODING is
optional and specifies the encoding of the word list. If it is left out
the encoding is expected to be in the default encoding for the language
as specified by the ‘data-encoding’ option. *Note data-encoding::.

The second part of simply a word list with one word per line.