There's an "app" for that...
If you have an iPhone there's a great app for decoding NOTAMs.
Here's an example of what you are asking about. The "S-LOC" refers to the straight in approach using a localizer only (minus glideslope).
FDC 9/8778 BNA FI/T NASHVILLE INTL, NASHVILLE, TN.
ILS OR LOC RWY 20R, AMDT 9 ...
DISREGARD NOTE INOPERATIVE TABLE DOES NOT APPLY TO
S-LOC 20R CAT C.