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diff --git a/tools/perf/pmu-events/arch/riscv/mapfile.csv b/tools/perf/pmu-events/arch/riscv/mapfile.csv
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+# Format:
+# MVENDORID-MARCHID-MIMPID,Version,JSON/file/pathname,Type
+#
+# where
+# MVENDORID JEDEC code of the core provider
+# MARCHID base microarchitecture of the hart
+# MIMPID unique encoding of the version
+# of the processor implementation
+# Version could be used to track version of JSON file
+# but currently unused.
+# JSON/file/pathname is the path to JSON file, relative
+# to tools/perf/pmu-events/arch/riscv/.
+# Type is core, uncore etc
+#
+#
+#MVENDORID-MARCHID-MIMPID,Version,Filename,EventType
+0x489-0x8000000000000007-0x[[:xdigit:]]+,v1,sifive/u74,core