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-rw-r--r--airtunes2.rst7
1 files changed, 5 insertions, 2 deletions
diff --git a/airtunes2.rst b/airtunes2.rst
index 195d178..f82f558 100644
--- a/airtunes2.rst
+++ b/airtunes2.rst
@@ -164,8 +164,11 @@ RtpHeader
NTP Timestamp
~~~~~~~~~~~~~
-This is an NTP Timestamp as described in RFC 3450 Section 4. and RFC 1305
-(TODO: check this is actually true)
+This is an NTP Timestamp as described in RFC 3450 Section 4. and RFC 1305.
+The timestamps used by iTunes and the device seems to come from a monotonic
+clock which starts at 0 when they just started/booted. This monotonic clock's
+origin of time is the unix epoch, which corresponds to 0x83aa7e80 seconds
+in NTP time.
::