CREATE TABLE table_61816 ("Perpetrator" TEXT, "Date" TEXT, "Year" FLOAT, "Location" TEXT, "Country" TEXT, "Killed" FLOAT, "Additional Notes" TEXT)

What are the additional notes for Cotabato?
SELECT "Additional Notes" FROM table_61816 WHERE "Location" = 'cotabato'
SELECT "Additional Notes" FROM "table_61816" WHERE "Location" = 'cotabato'