diff --git a/tools/perf/Documentation/perf-annotate.txt b/tools/perf/Documentation/perf-annotate.txt
index 2a5975c91cbd2c57bb6fe3b11f9cbb07b08c28be..c635eab6af5409ddb6b19d249084a79aa825acf2 100644
--- a/tools/perf/Documentation/perf-annotate.txt
+++ b/tools/perf/Documentation/perf-annotate.txt
@@ -92,6 +92,8 @@ OPTIONS
 --asm-raw::
 	Show raw instruction encoding of assembly instructions.
 
+--show-total-period:: Show a column with the sum of periods.
+
 --source::
 	Interleave source code with assembly code. Enabled by default,
 	disable with --no-source.