diff --git a/doc/advertising-api.txt b/doc/advertising-api.txt
index 4ee37bb..1c18ae3 100644
--- a/doc/advertising-api.txt
+++ b/doc/advertising-api.txt
@@ -3,7 +3,7 @@ BlueZ D-Bus LE Advertising API Description
 
 Advertising packets are structured data which is broadcast on the LE Advertising
 channels and available for all devices in range.  Because of the limited space
-available in LE Advertising packets (32 bytes), each packet's contents must be
+available in LE Advertising packets (31 bytes), each packet's contents must be
 carefully controlled.
 
 BlueZ acts as a store for the Advertisement Data which is meant to be sent.