diff --git a/include/xo/gc/DX1Collector.hpp b/include/xo/gc/DX1Collector.hpp
index 2ef7148..539c77e 100644
--- a/include/xo/gc/DX1Collector.hpp
+++ b/include/xo/gc/DX1Collector.hpp
@@ -155,9 +155,12 @@ namespace xo {
              **/
             bool install_type(const AGCObject & meta) noexcept;
 
-            /** add GC root at @p root_addr, with type @p typeseq **/
+            /** add GC root at @p *p_root **/
             void add_gc_root_poly(obj<AGCObject> * p_root) noexcept;
 
+            /** remove GC root at @p *p_root **/
+            void remove_gc_root_poly(obj<AGCObject> * p_root) noexcept;
+
             // ----- collection -----
 
             /** Request immediate collection.