2 files changed, 7 insertions, 9 deletions

diff --git a/doc/extensions.html b/doc/extensions.html
index 6d3518ea..35bd6c92 100644
--- a/doc/extensions.html
+++ b/doc/extensions.html
@@ -208,9 +208,8 @@ bytecode (e.g. from Lua 5.1) is incompatible and cannot be loaded.
 </p>
 <p>
 Note: <tt>LJ_GC64</tt> mode requires a different frame layout, which implies
-a different, incompatible bytecode format for ports that use this mode (e.g.
-ARM64 or MIPS64) or when explicitly enabled for x64. This may be rectified
-in the future.
+a different, incompatible bytecode format for all 64 bit ports. This may be
+rectified in the future.
 </p>
 
 <h3 id="table_new"><tt>table.new(narray, nhash)</tt> allocates a pre-sized table</h3>
diff --git a/doc/install.html b/doc/install.html
index 49d6e9ed..9e00b231 100644
--- a/doc/install.html
+++ b/doc/install.html
@@ -175,12 +175,11 @@ Please read the instructions given in these files, before changing
 any settings.
 </p>
 <p>
-LuaJIT on x64 currently uses 32 bit GC objects by default.
-<tt>LJ_GC64</tt> mode may be explicitly enabled:
-add <tt>XCFLAGS=-DLUAJIT_ENABLE_GC64</tt> to the make command or run
-<tt>msvcbuild gc64</tt> for MSVC/WinSDK. Please check the note
-about the <a href="extensions.html#string_dump">bytecode format</a>
-differences, too.
+All LuaJIT 64 bit ports use 64 bit GC objects by default (<tt>LJ_GC64</tt>).
+For x64, you can select the old 32-on-64 bit mode by adding
+<tt>XCFLAGS=-DLUAJIT_DISABLE_GC64</tt> to the make command.
+Please check the note about the
+<a href="extensions.html#string_dump">bytecode format</a> differences, too.
 </p>
 
 <h2 id="posix">POSIX Systems (Linux, OSX, *BSD etc.)</h2>