LZF encoding bit is wrong in redis-2.8.13

[sagrada1788]

"""
Compressed Strings
First read the section “Length Encoding”, specifically the part when the first two bits are 11. In this case, the remaining 6 bits are read.
If the value of those 6 bits is 4, it indicates that a compressed string follows.
"""
Hint above is not correct.
In fact, in version 2.8.13, it is 'c3' means lzf compressed instead of 'c4'.
So "If the value of those 6 bits is 4" should change to "If the value of those 6 bits is 3"