diff --git a/mps/manual/source/pool/ams.rst b/mps/manual/source/pool/ams.rst
index 922d9d8e366..b5d7db84757 100644
--- a/mps/manual/source/pool/ams.rst
+++ b/mps/manual/source/pool/ams.rst
@@ -103,17 +103,13 @@ AMS interface
     :term:`pool`.
 
     When creating an AMS pool, :c:func:`mps_pool_create_k` requires
-    two :term:`keyword arguments`:
+    one :term:`keyword argument`:
 
     * :c:macro:`MPS_KEY_FORMAT` (type :c:type:`mps_fmt_t`) specifies
       the :term:`object format` for the objects allocated in the pool.
       The format must provide a :term:`scan method` and a :term:`skip
       method`.
 
-    * :c:macro:`MPS_KEY_CHAIN` (type :c:type:`mps_chain_t`) specifies
-      the :term:`generation chain` for the pool. It must have a single
-      generation.
-
     It accepts three optional keyword arguments:
 
     * :c:macro:`MPS_KEY_CHAIN` (type :c:type:`mps_chain_t`) specifies
@@ -186,7 +182,7 @@ AMS interface
     class.
 
     When creating a debugging AMS pool, :c:func:`mps_pool_create_k`
-    requires three keyword arguments: :c:macro:`MPS_KEY_FORMAT` and
+    takes three keyword arguments: :c:macro:`MPS_KEY_FORMAT` and
     :c:macro:`MPS_KEY_CHAIN` are as described above, and
     :c:macro:`MPS_KEY_POOL_DEBUG_OPTIONS` specifies the debugging
     options. See :c:type:`mps_debug_option_s`.
diff --git a/mps/manual/source/pool/mv.rst b/mps/manual/source/pool/mv.rst
index b49fc34e1f9..6a9d6e9e666 100644
--- a/mps/manual/source/pool/mv.rst
+++ b/mps/manual/source/pool/mv.rst
@@ -118,7 +118,7 @@ MV interface
     class.
 
     When creating a debugging MV pool, :c:func:`mps_pool_create_k`
-    requires four keyword arguments: :c:macro:`MPS_KEY_EXTEND_SIZE`,
+    takes four keyword arguments: :c:macro:`MPS_KEY_EXTEND_SIZE`,
     :c:macro:`MPS_KEY_MEAN_SIZE`, :c:macro:`MPS_KEY_MAX_SIZE` are as
     described above, and :c:macro:`MPS_KEY_POOL_DEBUG_OPTIONS`
     specifies the debugging options. See :c:type:`mps_debug_option_s`.
diff --git a/mps/manual/source/pool/mvff.rst b/mps/manual/source/pool/mvff.rst
index 0b184615909..7536d2d5d75 100644
--- a/mps/manual/source/pool/mvff.rst
+++ b/mps/manual/source/pool/mvff.rst
@@ -195,7 +195,7 @@ MVFF interface
     class.
 
     When creating a debugging MVFF pool, :c:func:`mps_pool_create_k`
-    requires seven :term:`keyword arguments`.
+    takes seven :term:`keyword arguments`.
 
     * :c:macro:`MPS_KEY_EXTEND_BY`, :c:macro:`MPS_KEY_MEAN_SIZE`,
       :c:macro:`MPS_KEY_ALIGN`, :c:macro:`MPS_KEY_MVFF_ARENA_HIGH`,