diff --git a/dev-util/perf/perf-5.12.ebuild b/dev-util/perf/perf-5.12.ebuild
index 2f8dc2e665ce2..74ab0c5a493dc 100644
--- a/dev-util/perf/perf-5.12.ebuild
+++ b/dev-util/perf/perf-5.12.ebuild
@@ -96,6 +96,8 @@ pkg_setup() {
 	python_setup
 }
 
+# src_unpack and src_prepare are copied to dev-util/bpftool since
+# it's building from the same tarball, please keep it in sync with bpftool
 src_unpack() {
 	local paths=(
 		tools/arch tools/build tools/include tools/lib tools/perf tools/scripts