It wasnarrated from Abu Hurairah that the Prophet (ﷺ) said:
"Whoevercatches one Rak'ah of Friday, let him add another Rak'ah toit." (IT)
English reference (IT): Vol. 1, Book 5, Hadith 1121 (IT)
Arabic reference (IT): Book 5, Hadith 1175 (IT)