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+++ b/comboot.doc
@@ -575,3 +575,11 @@ AX=0012h [3.05] Cleanup, shuffle and boot
were set up by the PXE ROM.
+AX=0013h [3.08] Idle loop call
+ Input: AX 0013h
+ Output: None
+
+ Call this routine while sitting in an idle loop. It performs
+ any periodic activities required by the filesystem code. At
+ the moment, this is a no-op on all derivatives except
+ PXELINUX, where it executes PXE calls to answer ARP queries.