diff --git a/docs/index.md b/docs/index.md
index 261f54f..7772ee7 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -11,7 +11,7 @@ Nevertheless, iwla is only focused on HTTP logs. It uses data (robots definition
 Usage
 -----
 
-    ./iwla [-c|--clean-output] [-i|--stdin] [-f FILE|--file FILE] [-d LOGLEVEL|--log-level LOGLEVEL] [-r|--reset year/month] [-z|--dont-compress]
+    ./iwla [-c|--clean-output] [-i|--stdin] [-f FILE|--file FILE] [-d LOGLEVEL|--log-level LOGLEVEL] [-r|--reset year/month] [-z|--dont-compress] [-p]
 
     -c : Clean output (database and HTML) before starting
     -i : Read data from stdin instead of conf.analyzed_filename
@@ -19,6 +19,7 @@ Usage
     -d : Loglevel in ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']
     -r : Reset analysis to a specific date (month/year)
     -z : Don't compress databases (bigger but faster, not  compatible with compressed databases)
+    -p : Only generate display
 
 Basic usage
 -----------