You use the semicolon to put comments in fpe files. I think that's what you're asking, but maybe not.
Example:
;This is my awesome fpe file
System Specs: OS - Windows 7 Home Premium 64-bit SP1, CPU - AMD Phenom II X4 945, 3.0Ghz, RAM - 8Gb DDR3, GFX Card - 2048MB NVIDIA GeForce GT 640, FPSC-R Version - Beta 1.0085