1 files changed, 1 insertions, 0 deletions
diff --git a/gc.rb b/gc.rb
index 23ed12ffdc..881b8659ce 100644
--- a/gc.rb
+++ b/gc.rb
@@ -26,6 +26,7 @@ module GC
   #
   #  Use full_mark: false to perform a minor GC.
   #  Use immediate_sweep: false to defer sweeping (use lazy sweep).
+  #  Use compact: true to compact the heap (it implies a full mark and sweep).
   #
   #  Note: These keyword arguments are implementation and version dependent. They
   #  are not guaranteed to be future-compatible, and may be ignored if the