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-rw-r--r--common.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/common.mk b/common.mk
index aec160cbb5..b9103ab3db 100644
--- a/common.mk
+++ b/common.mk
@@ -1597,7 +1597,7 @@ help: PHONY
" test-tool: tests under the tool/test" \
" update-gems: download files of the bundled gems" \
" update-bundled_gems: update the latest version of bundled gems" \
- " sync-default-gems: sync default gems from upstream [GEM=<gem_name>]" \
+ " sync-default-gems: sync default gems from upstream [GEM=<gem_name git_ref>]" \
" up: update local copy and autogenerated files" \
" benchmark: benchmark this ruby and COMPARE_RUBY." \
" gcbench: gc benchmark [GCBENCH_ITEM=<item_name>]" \