diff --git a/HowtoAtop.md b/HowtoAtop.md
index d96a2c44..4f520761 100644
--- a/HowtoAtop.md
+++ b/HowtoAtop.md
@@ -19,4 +19,19 @@ Turning on process accounting, file set to '/var/log/account/pacct'.
 
 ~~~
 accton off
-~~~
\ No newline at end of file
+~~~
+
+# Loguer
+
+~~~
+atop -w <file>
+~~~
+
+# Lire log
+
+~~~
+atop -r <file>
+~~~
+
+* t : 10 secondes plus tard
+* T : 10 secondes précédente
\ No newline at end of file