diff --git a/botc_defs.bts b/botc_defs.bts
index 07ae6d4..313b146 100644
--- a/botc_defs.bts
+++ b/botc_defs.bts
@@ -102,6 +102,13 @@ funcdef void	90:SayFromChatLump (str section);
 funcdef bool	91:ChatSectionExistsInLump (str lump, str section);
 funcdef bool	92:ChatSectionExistsInChatLump (str section);
 
+// =============================================================================
+//
+// Builtin function definitions
+// Syntax: funcdef <return> <num>:<name> (<args>)
+//
+builtindef void 70:ArraySet (int array, int value, int numBytes);
+
 // =============================================================================
 //
 // Events: