diff --git a/config b/config
index 29786c0..711dd20 100644
--- a/config
+++ b/config
@@ -10,6 +10,8 @@ font = Monospace 9
 #mouse_autohide = false
 #scroll_on_output = false
 #scroll_on_keystroke = true
+# Length of the scrollback buffer, 0 disabled the scrollback buffer
+# and setting it to a negative value means "infinite scrollback"
 scrollback_lines = 10000
 #search_wrap = true
 #urgent_on_bell = true
diff --git a/man/termite.config.5 b/man/termite.config.5
index 3de52ec..95262c5 100644
--- a/man/termite.config.5
+++ b/man/termite.config.5
@@ -44,7 +44,9 @@ resource for \fBxterm\fR(1).
 .IP \fImouse_autohide\fR
 Automatically hide the mouse pointer when you start typing.
 .IP \fIscrollback_lines\fR
-Set the number of lines to limit the terminal's scrollback.
+Set the number of lines to limit the terminal's scrollback. Setting
+the number of lines to 0 disables this feature, a negative value makes
+the scrollback "infinite".
 .IP \fIscroll_on_keystroke\fR
 Scroll to the bottom automatically when a key is pressed.
 .IP \fIscroll_on_output\fR