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-rw-r--r--tools/perf/design.txt3
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diff --git a/tools/perf/design.txt b/tools/perf/design.txt
index f1946d107b10..fdd42a824c98 100644
--- a/tools/perf/design.txt
+++ b/tools/perf/design.txt
@@ -455,3 +455,6 @@ will need at least this:
455 455
456If your architecture does have hardware capabilities, you can override the 456If your architecture does have hardware capabilities, you can override the
457weak stub hw_perf_event_init() to register hardware counters. 457weak stub hw_perf_event_init() to register hardware counters.
458
459Architectures that have d-cache aliassing issues, such as Sparc and ARM,
460should select PERF_USE_VMALLOC in order to avoid these for perf mmap().