diff --git a/CHANGES b/CHANGES
index e53399b6..947edcee 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,7 @@ SVN HEAD
   Library: Add support for the pc87247 driver (fans only)
            Probe for busses before chips
            Drop support for algorithm names
+  Man page i2cdetect.8: Describe the output convention
   Man page sensors.1: Update (option -c) and clean up
   Module icspll: Delete. It was useless and dangerous.
   Program sensord: Add pc87247 support (fans only)
diff --git a/prog/detect/i2cdetect.8 b/prog/detect/i2cdetect.8
index 9ed49e11..f47452f0 100644
--- a/prog/detect/i2cdetect.8
+++ b/prog/detect/i2cdetect.8
@@ -1,4 +1,4 @@
-.TH I2CDETECT 8 "April 2006"
+.TH I2CDETECT 8 "October 2006"
 .SH NAME
 i2cdetect \- detect I2C chips
 
@@ -31,6 +31,17 @@ i2cdetect can also be used to query the functionalities of an I2C bus
 .SH WARNING
 This program can confuse your I2C bus, cause data loss and worse!
 
+.SH INTERPRETING THE OUTPUT
+Each cell in the output table will contain one of the following symbols:
+.IP \(bu "\w'\(bu'u+1n"
+"XX". The address was probed but no chip answered.
+.IP \(bu
+"UU". Probing was skipped, because this address is currently in use by
+a driver. This strongly suggests that there is a chip at this address.
+.IP \(bu
+An address number in hexadecimal, e.g. "2d" or "4e". A chip
+was found at this address.
+
 .SH OPTIONS
 .TP
 .B "\-y"