Règle correspondante
Practice Relating to Rule 20. Advance Warning
Kenya’s LOAC Manual (1997) provides:
When the tactical situation permits, effective advance warning shall be given of attacks which may affect the civilian population (e.g. infantry fire to encourage civilian persons to seek shelter, discharge of leaflets from aircraft). The advance warning given shall allow the defender to take safeguard measures and to give appropriate information. 
Kenya, Law of Armed Conflict, Military Basic Course (ORS), 4 Précis, The School of Military Police, 1997, Précis No. 4, p. 8; see also Précis No. 4, p. 2.