diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index 8974e20..20d97d8 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -1,5 +1,5 @@
 perf-diff(1)
-==============
+============
 
 NAME
 ----