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-rw-r--r--tools/perf/Documentation/perf-buildid-cache.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-buildid-cache.txt b/tools/perf/Documentation/perf-buildid-cache.txt
index 8e798baae0fd..e9a8349a7172 100644
--- a/tools/perf/Documentation/perf-buildid-cache.txt
+++ b/tools/perf/Documentation/perf-buildid-cache.txt
@@ -27,6 +27,10 @@ OPTIONS
-M::
--missing=::
List missing build ids in the cache for the specified file.
+-u::
+--update::
+ Update specified file of the cache. It can be used to update kallsyms
+ kernel dso to vmlinux in order to support annotation.
-v::
--verbose::
Be more verbose.