[Zz] How does the SAVE Function save data without overwriting the original file content?

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How does the SAVE Function save data without overwriting the original file content ??
Ladies and Gentlemen:
I want to use the SAVE Function to save a data matrix to a TXT text file. However, there are some textual descriptions in this file, which are useful to me, how can I use the SAVE Function to save data without overwriting these descriptions ??
Note: I only want to use the SAVE Function for saving. Can I achieve this purpose?

 

P = '000000 ';

Save('test_save.txt ', 'P','-ASCII ')

Type test_save.txt

S = '000000'

Save('test_save.txt ','s', '-ASCII', '-append ')

Type test_save.txt

Char(textread('test_save.txt '))

Ans =

888

121121121