diff --git a/mps/manual/source/topic/error.rst b/mps/manual/source/topic/error.rst
index e65f6eafebd..fe515c9ca40 100644
--- a/mps/manual/source/topic/error.rst
+++ b/mps/manual/source/topic/error.rst
@@ -260,6 +260,13 @@ this documentation.
     :c:type:`mps_fmt_t` for this argument.
 
 
+``global.c: PoolHasAttr(pool, AttrGC)``
+
+    The client program called :c:func:`mps_finalize` on a reference
+    that does not belong to an :term:`automatically managed <automatic
+    memory management>` :term:`pool`.
+
+
 ``lockix.c: res == 0``
 
 ``lockw3.c: lock->claims == 0``