diff --git a/docs/markdown/Release-notes-for-1.4.0.md b/docs/markdown/Release-notes-for-1.4.0.md
new file mode 100644
index 0000000..12dc3a8
--- /dev/null
+++ b/docs/markdown/Release-notes-for-1.4.0.md
@@ -0,0 +1,111 @@
+---
+title: Release 1.4.0
+short-description: Release notes for 1.4.0
+...
+
+# New features
+
+Meson 1.4.0 was released on 12 March 2024
+
+## Added support for `[[@build_tgt]]`, `[[@custom_tgt]]`, and `[[@custom_idx]]` to certain FS module functions
+
+Support for `[[@build_tgt]]`, `[[@custom_tgt]]`, and `[[@custom_idx]]` was
+added to the following FS module APIs:
+
+- `fs.name`
+- `fs.parent`
+- `fs.replace_suffix`
+- `fs.stem`
+
+## Meson now reads the project version of cmake subprojects
+
+CMake subprojects configured by meson will now have their project
+version set to the project version in their CMakeLists.txt. This
+allows version constraints to be properly checked when falling back to
+a cmake subproject.
+
+## `ndebug` setting now controls C++ stdlib assertions
+
+The `ndebug` setting, if disabled, now passes preprocessor defines to enable
+debugging assertions within the C++ standard library.
+
+For GCC, `-D_GLIBCXX_ASSERTIONS=1` is set.
+
+For Clang, `-D_GLIBCXX_ASSERTIONS=1` is set to cover libstdc++ usage,
+and `-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE` or
+`-D_LIBCPP_ENABLE_ASSERTIONS=1` is used depending on the Clang version.
+
+## `stldebug` gains Clang support
+
+For Clang, we now pass `-D_GLIBCXX_DEBUG=1` if `debugstl` is enabled, and
+we also pass `-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG`.
+
+## New `unset()` method on `environment` objects
+
+[[@env]] now has an [[env.unset]] method to ensure an existing environment
+is *not* defined.
+
+## File object now has `full_path()` method
+
+Returns a full path pointing to the file. This is useful for printing the path
+with e.g [[message]] function for debugging purpose.
+
+**NOTE:** In most cases using the object itself will do the same job
+as this and will also allow Meson to setup dependencies correctly.
+
+## New numpy custom dependency
+
+Support for `dependency('numpy')` was added, via supporting the `numpy-config` tool and
+pkg-config support, both of which are available since NumPy 2.0.0.
+
+Config-tool support is useful because it will work out of the box when
+``numpy`` is installed, while the pkg-config file is located inside python's
+site-packages, which makes it impossible to use in an out of the box manner
+without setting `PKG_CONFIG_PATH`.
+
+## `depends` kwarg now supported by compiler.preprocess()
+
+It is now possible to specify the dependent targets with `depends:`
+for compiler.preprocess(). These targets should be built before the
+preprocessing starts.
+
+## Added `preserve_paths` keyword argument to qt module functions.
+
+In `qt4`, `qt5`, and `qt6` modules, `compile_ui`, `compile_moc`, and
+`preprocess` functions now have a `preserve_paths` keyword argument.
+
+If `'true`, it specifies that the output files need to maintain their directory
+structure inside the target temporary directory. For instance, when a file
+called `subdir/one.input` is processed it generates a file
+`{target private directory}/subdir/one.out` when `true`,
+and `{target private directory}/one.out` when `false` (default).
+
+## Bindgen will now use Meson's heuristic for what is a C++ header
+
+Bindgen natively assumes that a file with the extension `.hpp` is a C++ header,
+but that everything else is a C header. Meson has a whole list of extensions it
+considers to be C++, and now will automatically look for those extensions and
+set bindgen to treat those as C++
+
+## Overriding bindgen language setting
+
+Even though Meson will now tell bindgen to do the right thing in most cases,
+there may still be cases where Meson does not have the intended behavior,
+specifically with headers with a `.h` suffix, but are C++ headers.
+
+## Bindgen now uses the same C/C++ std as the project as a whole
+
+Which is very important for C++ bindings.
+
+## Tests now abort on errors by default under more sanitizers
+
+Sanitizers like MemorySanitizer do not abort
+by default on detected violations. Meson now exports `MSAN_OPTIONS` (in addition to
+`ASAN_OPTIONS` and `UBSAN_OPTIONS` from a previous release) when unset in the
+environment to provide sensible abort-by-default behavior.
+
+## Use `custom_target` as test executable
+
+The [[test]] function now accepts [[@custom_tgt]] and [[@custom_idx]] for the
+command to execute.
+
diff --git a/docs/markdown/snippets/additional_types_for_fs_module.md b/docs/markdown/snippets/additional_types_for_fs_module.md
deleted file mode 100644
index 86f2de9..0000000
--- a/docs/markdown/snippets/additional_types_for_fs_module.md
+++ /dev/null
@@ -1,9 +0,0 @@
-## Added support for `[[@build_tgt]]`, `[[@custom_tgt]]`, and `[[@custom_idx]]` to certain FS module functions
-
-Support for `[[@build_tgt]]`, `[[@custom_tgt]]`, and `[[@custom_idx]]` was
-added to the following FS module APIs:
-
-- `fs.name`
-- `fs.parent`
-- `fs.replace_suffix`
-- `fs.stem`
diff --git a/docs/markdown/snippets/cmake-project-version.md b/docs/markdown/snippets/cmake-project-version.md
deleted file mode 100644
index 0bc120b..0000000
--- a/docs/markdown/snippets/cmake-project-version.md
+++ /dev/null
@@ -1,6 +0,0 @@
-## Meson now reads the project version of cmake subprojects
-
-CMake subprojects configured by meson will now have their project
-version set to the project version in their CMakeLists.txt. This
-allows version constraints to be properly checked when falling back to
-a cmake subproject.
diff --git a/docs/markdown/snippets/cpp-debug.md b/docs/markdown/snippets/cpp-debug.md
deleted file mode 100644
index 2a62b93..0000000
--- a/docs/markdown/snippets/cpp-debug.md
+++ /dev/null
@@ -1,10 +0,0 @@
-## `ndebug` setting now controls C++ stdlib assertions
-
-The `ndebug` setting, if disabled, now passes preprocessor defines to enable
-debugging assertions within the C++ standard library.
-
-For GCC, `-D_GLIBCXX_ASSERTIONS=1` is set.
-
-For Clang, `-D_GLIBCXX_ASSERTIONS=1` is set to cover libstdc++ usage,
-and `-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE` or
-`-D_LIBCPP_ENABLE_ASSERTIONS=1` is used depending on the Clang version.
diff --git a/docs/markdown/snippets/cpp-stldebug.md b/docs/markdown/snippets/cpp-stldebug.md
deleted file mode 100644
index ba04736..0000000
--- a/docs/markdown/snippets/cpp-stldebug.md
+++ /dev/null
@@ -1,4 +0,0 @@
-## `stldebug` gains Clang support
-
-For Clang, we now pass `-D_GLIBCXX_DEBUG=1` if `debugstl` is enabled, and
-we also pass `-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG`.
diff --git a/docs/markdown/snippets/environment_unset.md b/docs/markdown/snippets/environment_unset.md
deleted file mode 100644
index 887bc0d..0000000
--- a/docs/markdown/snippets/environment_unset.md
+++ /dev/null
@@ -1,4 +0,0 @@
-## New `unset()` method on `environment` objects
-
-[[@env]] now has an [[env.unset]] method to ensure an existing environment
-is *not* defined.
diff --git a/docs/markdown/snippets/file-full-path.md b/docs/markdown/snippets/file-full-path.md
deleted file mode 100644
index fbb8e54..0000000
--- a/docs/markdown/snippets/file-full-path.md
+++ /dev/null
@@ -1,7 +0,0 @@
-## File object now has `full_path()` method
-
-Returns a full path pointing to the file. This is useful for printing the path
-with e.g [[message]] function for debugging purpose.
-
-**NOTE:** In most cases using the object itself will do the same job
-as this and will also allow Meson to setup dependencies correctly.
diff --git a/docs/markdown/snippets/numpy-custom-dependency.md b/docs/markdown/snippets/numpy-custom-dependency.md
deleted file mode 100644
index 5934180..0000000
--- a/docs/markdown/snippets/numpy-custom-dependency.md
+++ /dev/null
@@ -1,9 +0,0 @@
-## New numpy custom dependency
-
-Support for `dependency('numpy')` was added, via supporting the `numpy-config` tool and
-pkg-config support, both of which are available since NumPy 2.0.0.
-
-Config-tool support is useful because it will work out of the box when
-``numpy`` is installed, while the pkg-config file is located inside python's
-site-packages, which makes it impossible to use in an out of the box manner
-without setting `PKG_CONFIG_PATH`.
diff --git a/docs/markdown/snippets/preprocess-depends.md b/docs/markdown/snippets/preprocess-depends.md
deleted file mode 100644
index 5312464..0000000
--- a/docs/markdown/snippets/preprocess-depends.md
+++ /dev/null
@@ -1,5 +0,0 @@
-## `depends` kwarg now supported by compiler.preprocess()
-
-It is now possible to specify the dependent targets with `depends:`
-for compiler.preprocess(). These targets should be built before the
-preprocessing starts.
diff --git a/docs/markdown/snippets/qt_preserve_path_from.md b/docs/markdown/snippets/qt_preserve_path_from.md
deleted file mode 100644
index 1a0923a..0000000
--- a/docs/markdown/snippets/qt_preserve_path_from.md
+++ /dev/null
@@ -1,10 +0,0 @@
-## Added `preserve_paths` keyword argument to qt module functions.
-
-In `qt4`, `qt5`, and `qt6` modules, `compile_ui`, `compile_moc`, and
-`preprocess` functions now have a `preserve_paths` keyword argument.
-
-If `'true`, it specifies that the output files need to maintain their directory
-structure inside the target temporary directory. For instance, when a file
-called `subdir/one.input` is processed it generates a file
-`{target private directory}/subdir/one.out` when `true`,
-and `{target private directory}/one.out` when `false` (default).
diff --git a/docs/markdown/snippets/rust-bindgen-cpp.md b/docs/markdown/snippets/rust-bindgen-cpp.md
deleted file mode 100644
index bcb1fea..0000000
--- a/docs/markdown/snippets/rust-bindgen-cpp.md
+++ /dev/null
@@ -1,6 +0,0 @@
-## Bindgen will now use Meson's heuristic for what is a C++ header
-
-Bindgen natively assumes that a file with the extension `.hpp` is a C++ header,
-but that everything else is a C header. Meson has a whole list of extensions it
-considers to be C++, and now will automatically look for those extensions and
-set bindgen to treat those as C++
diff --git a/docs/markdown/snippets/rust-bindgen-language.md b/docs/markdown/snippets/rust-bindgen-language.md
deleted file mode 100644
index edfb3bf..0000000
--- a/docs/markdown/snippets/rust-bindgen-language.md
+++ /dev/null
@@ -1,5 +0,0 @@
-## Overriding bindgen language setting
-
-Even though Meson will now tell bindgen to do the right thing in most cases,
-there may still be cases where Meson does not have the intended behavior,
-specifically with headers with a `.h` suffix, but are C++ headers.
diff --git a/docs/markdown/snippets/rust-bindgen-std.md b/docs/markdown/snippets/rust-bindgen-std.md
deleted file mode 100644
index 34ae611..0000000
--- a/docs/markdown/snippets/rust-bindgen-std.md
+++ /dev/null
@@ -1,3 +0,0 @@
-## Bindgen now uses the same C/C++ std as the project as a whole
-
-Which is very important for C++ bindings.
diff --git a/docs/markdown/snippets/sanitizers_test.md b/docs/markdown/snippets/sanitizers_test.md
deleted file mode 100644
index de93852..0000000
--- a/docs/markdown/snippets/sanitizers_test.md
+++ /dev/null
@@ -1,6 +0,0 @@
-## Tests now abort on errors by default under more sanitizers
-
-Sanitizers like MemorySanitizer do not abort
-by default on detected violations. Meson now exports `MSAN_OPTIONS` (in addition to
-`ASAN_OPTIONS` and `UBSAN_OPTIONS` from a previous release) when unset in the
-environment to provide sensible abort-by-default behavior.
diff --git a/docs/markdown/snippets/test_using_custom_target_executable.md b/docs/markdown/snippets/test_using_custom_target_executable.md
deleted file mode 100644
index e8b08da..0000000
--- a/docs/markdown/snippets/test_using_custom_target_executable.md
+++ /dev/null
@@ -1,4 +0,0 @@
-## Use `custom_target` as test executable
-
-The [[test]] function now accepts [[@custom_tgt]] and [[@custom_idx]] for the
-command to execute.
diff --git a/docs/sitemap.txt b/docs/sitemap.txt
index 5eb2284..04f7fda 100644
--- a/docs/sitemap.txt
+++ b/docs/sitemap.txt
@@ -88,6 +88,7 @@
 		Wrap-best-practices-and-tips.md
 		Shipping-prebuilt-binaries-as-wraps.md
 	Release-notes.md
+		Release-notes-for-1.4.0.md
 		Release-notes-for-1.3.0.md
 		Release-notes-for-1.2.0.md
 		Release-notes-for-1.1.0.md