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-rw-r--r--src/gc.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/gc.c b/src/gc.c
index 8ff1ecc10..c9021a4b0 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -65,10 +65,11 @@
mruby implementer and C extension library writer must write a write
barrier when writing a pointer to an object on object's field.
- Two different write barrier are available:
+ When writing a pointer to B object on A object's field,
+ two different write barrier are available:
- * mrb_field_write_barrier
- * mrb_write_barrier
+ * mrb_field_write_barrier - target B object for a mark.
+ * mrb_write_barrier - target A object for a mark.
== Generational Mode