THE ULTIMATE GUIDE TO SPELLING RULES IN ENGLISH GRAMMAR

If unsure about ie or ei, once the audio from the vowel is as in brief /i:/, we spell it ie; but once the letter c, we spell it ei:Referer – common misspelling with the word referrer. It's so common that it manufactured it into the official specification of HTTP – the communication protocol in the Web – and has, thus, grow to be the regular m