I actually created more.
Here's the rundown of the STR section:
1 int - Number of strings (usually 1024) (not including first null string)
X ints - Offset for each string (X = number above) (Offset from start of section)
After this comes each string, terminated by a null character. Note that the first thing in this section will be a null character, which means string #0 is null. Also, the first offset is 2 * (number of strings + 1).
To make more strings, I simply changed the first int to 1025, added an int to the offsets (and filled in the correct value), added 2 to all the existing offsets, and added the new string at the end of the section.