diff --git a/README.md b/README.md
index 4b5beb3..2791928 100755
--- a/README.md
+++ b/README.md
@@ -62,9 +62,9 @@ If true, then all input formats are normalised to lowercase alphanumeric strings
 Default: false
 
 ### SINATRA_SESSION_DURATION
-Sets the RADIUS session duration in minutes.
+Sets the RADIUS session duration in seconds.
 
-Default: 60
+Default: 600
 
 ### SINATRA_TIME_RULES
 Sets whether time rules are to be processed.