The Rectifications of 1990
The Council, with the help of some Académie members and observers from Francophone states, published reforms that it called "rectifications orthographiques" on 6 December 1990.
Those "rectifications", instead of changing individual spellings, published general rules or lists of modified words. In total, around 2000 words have seen their spelling changed, and French morphology was also affected.
Read more about this topic: Reforms Of French Orthography