Add filter example

kgryte · kgryte · commit 606c8b7c8a2c · 2018-01-11T00:23:35.000-08:00
diff --git a/tools/make/lib/benchmark/cpp.mk b/tools/make/lib/benchmark/cpp.mk
@@ -15,6 +15,9 @@
 #
 # @example
 # make benchmark-cpp
+#
+# @example
+# make benchmark-cpp BENCHMARKS_FILTER=.*/math/base/special/beta/.*
 #/
 benchmark-cpp:
 	$(QUIET) $(FIND_CPP_BENCHMARKS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
