RFC1321 - MD5 algorithm document

Attempting to implement the MD5 algorithm.

I understand this:
Let [abcd k s i] denote the operation:
a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s)
...
Let [abcd k s i] denote the operation
a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s)

But I do not understand this:
Let [abcd k s t] denote the operation
a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s)
...
Let [abcd k s t] denote the operation
a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s)

Where the hell did "i" go and what is "t"??? Have I acquired an old RFC document?

Ah, checked the Errata over at RFC. Turned out this had been corrected, but not updated in the RFC document in over 10 years.......

RFC should be replaced by a new standards authority! Let's call it 4chanDOCS! =)