diff --git a/monitor/btmon.rst b/monitor/btmon.rst
index 0ab13eb..82f9381 100644
--- a/monitor/btmon.rst
+++ b/monitor/btmon.rst
@@ -33,7 +33,9 @@ OPTIONS
 -w FILE, --write FILE       Save traces in btsnoop format to *FILE*.
 -a FILE, --analyze FILE     Analyze traces in btsnoop format from *FILE*.
                             It displays the devices found in the *FILE* with
-                            its packets by type.
+			    its packets by type. If gnuplot is installed on
+			    the system it also attempts to plot packet latency
+			    graph.
 -s SOCKET, --server SOCKET  Start monitor server socket.
 -p PRIORITY, --priority PRIORITY  Show only priority or lower for user log.
 
diff --git a/monitor/main.c b/monitor/main.c
index decf7cc..fa56fcb 100644
--- a/monitor/main.c
+++ b/monitor/main.c
@@ -51,6 +51,9 @@ static void usage(void)
 		"\t-r, --read <file>      Read traces in btsnoop format\n"
 		"\t-w, --write <file>     Save traces in btsnoop format\n"
 		"\t-a, --analyze <file>   Analyze traces in btsnoop format\n"
+		"\t                       If gnuplot is installed on the\n"
+                "\t                       system it will also attempt to plot\n"
+		"\t                       packet latency graph.\n"
 		"\t-s, --server <socket>  Start monitor server socket\n"
 		"\t-p, --priority <level> Show only priority or lower\n"
 		"\t-i, --index <num>      Show only specified controller\n"