1 files changed, 5 insertions(+), 4 deletions(-)

M doc/grammar.txt

@@ 25,12 25,13 @@
 # A message label is iface << 16 | serial, where serial is assigned from 0 for
 # each method in order of appearance.
 #
-# Each IPC message has two result registers.
+# Each IPC message has two result registers: the label of the message tag, and
+# the IPC register.
 #
-# The first register selects the result type from among the options and has the
-# following 64-bit format:
+# The label selects the result type from among the options and has the
+# following 48-bit format:
 #
-# 00000000000000000000000000000000HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
+# 0000000000000000HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
 #
 # If the result is a primitive or enum type, all bits are set to zero. For unit
 # and error results, H is set to the FNV-32 hash of the fully qualified