diff --git a/mps/manual/build.txt b/mps/manual/build.txt
index 7b8e17c51b9..b462f013ea9 100644
--- a/mps/manual/build.txt
+++ b/mps/manual/build.txt
@@ -137,6 +137,8 @@ Platform     OS          Architecture    Compiler      Makefile
 ==========   =========   =============   ============  =================
 ``fri3gc``   FreeBSD     IA-32           GCC           ``fri3gc.gmk``
 ``fri6gc``   FreeBSD     x86_64          GCC           ``fri6gc.gmk``
+``fri3ll``   FreeBSD     IA-32           Clang         ``fri3ll.gmk``
+``fri6ll``   FreeBSD     x86_64          Clang         ``fri6ll.gmk``
 ``lii3gc``   Linux       IA-32           GCC           ``lii3gc.gmk``
 ``lii6gc``   Linux       x86_64          GCC           ``lii6gc.gmk``
 ``lii6ll``   Linux       x86_64          Clang         ``lii6ll.gmk``
@@ -175,9 +177,9 @@ To build a restricted set of targets for just one variety, run::
     make -f <makefile> 'VARIETY=<variety>' <target>
 
 For example, to build just the "cool" variety of the ``amcss`` test on
-FreeBSD::
+64-bit Linux with Clang::
 
-    gmake -f fri3gc.gmk VARIETY=cool amcss
+    gmake -f lii6ll.gmk VARIETY=cool amcss
 
 On Windows platforms you need to run the "Visual Studio Command Prompt"
 from the Start menu.  Then run one of these commands::
@@ -199,7 +201,7 @@ On Mac OS X, you can build from the command line with::
     xcodebuild
 
 On most platforms, the output of the build goes to a directory named
-after the platform (e.g. ``fri3gc``) so that you can share the source
+after the platform (e.g. ``lii6ll``) so that you can share the source
 tree across platforms.  On Mac OS X the output goes in a directory
 called ``xc``.  Building generates ``mps.a`` or ``mps.lib`` or
 equivalent, a library of object code which you can link with your
diff --git a/mps/manual/source/release.rst b/mps/manual/source/release.rst
index f95aaba331e..21e426f13cc 100644
--- a/mps/manual/source/release.rst
+++ b/mps/manual/source/release.rst
@@ -12,6 +12,9 @@ Release 1.115.0
 New features
 ............
 
+#. New supported platforms ``fri3ll`` (FreeBSD, IA-32, Clang/LLVM)
+   and ``fri6ll`` (FreeBSD, x86-64, Clang/LLVM).
+
 #. When creating an :ref:`pool-amc` pool, :c:func:`mps_pool_create_k`
    accepts the new keyword argument :c:macro:`MPS_KEY_EXTEND_BY`,
    specifying the minimum size of the memory segments that the pool
@@ -105,6 +108,26 @@ Other changes
 
    .. _job003866: https://www.ravenbrook.com/project/mps/issue/job003866/
 
+#. The MPS can now make use of :term:`spare committed memory` even if
+   it is :term:`mapped` at an unhelpful address, by unmapping it and
+   remapping at a better address. See job003898_.
+
+   .. _job003898: https://www.ravenbrook.com/project/mps/issue/job003898/
+
+#. :c:func:`mps_arena_step` now always considers starting a new
+   :term:`garbage collection` if the remaining idle time is long
+   enough to complete it. (Previously, if there was already a
+   collection in progress when :c:func:`mps_arena_step` was called, it
+   would finish the collection but not consider starting a new one.)
+   See job003934_.
+
+   .. _job003934: https://www.ravenbrook.com/project/mps/issue/job003934/
+
+#. The MPS no longer carries out :term:`garbage collections` when there
+   is no collection work to be done. See job003938_.
+
+   .. _job003938: https://www.ravenbrook.com/project/mps/issue/job003938/
+
 
 .. _release-notes-1.114:
 
diff --git a/mps/manual/source/topic/platform.rst b/mps/manual/source/topic/platform.rst
index e74aa34cde2..15873d27af4 100644
--- a/mps/manual/source/topic/platform.rst
+++ b/mps/manual/source/topic/platform.rst
@@ -149,6 +149,20 @@ Platform interface
     x86-64 processor architecture, and the GCC compiler.
 
 
+.. c:macro:: MPS_PF_FRI3GC
+
+    A :term:`C` preprocessor macro that indicates, if defined, that
+    the :term:`platform` consists of the FreeBSD operating system, the
+    IA-32 processor architecture, and the Clang/LLVM compiler.
+
+
+.. c:macro:: MPS_PF_FRI6GC
+
+    A :term:`C` preprocessor macro that indicates, if defined, that
+    the :term:`platform` consists of the FreeBSD operating system, the
+    x86-64 processor architecture, and the Clang/LLVM compiler.
+
+
 .. c:macro:: MPS_PF_LII3GC
 
     A :term:`C` preprocessor macro that indicates, if defined, that
@@ -328,8 +342,10 @@ the Memory Pool System, with their current status.
 Platform    Status
 ==========  =======================
 ``fri3gc``  Supported
+``fri3ll``  Supported
 ``fri4gc``  Corrected to ``fri3gc``
 ``fri6gc``  Supported
+``fri6ll``  Supported
 ``i5m2cc``  *Not supported*
 ``iam4cc``  *Not supported*
 ``lii3eg``  *Not supported*