diff --git a/doc/docs.md b/doc/docs.md
index 6dbf8d3095..91ac881677 100644
--- a/doc/docs.md
+++ b/doc/docs.md
@@ -6286,7 +6286,7 @@ Full list of builtin options:
 |--------------------------------|------------------|-------------------------------|-----------------------------------------------|
 | `windows`, `linux`, `macos`    | `gcc`, `tinyc`   | `amd64`, `arm64`, `aarch64`   | `debug`, `prod`, `test`                       |
 | `darwin`, `ios`, `bsd`         | `clang`, `mingw` | `i386`, `arm32`               | `js`, `glibc`, `prealloc`                     |
-| `freebsd`, `openbsd`, `netbsd` | `msvc`           | `rv64`, `rv32`                | `no_bounds_checking`, `freestanding`          |
+| `freebsd`, `openbsd`, `netbsd` | `msvc`           | `rv64`, `rv32`, `s390x`       | `no_bounds_checking`, `freestanding`          |
 | `android`, `mach`, `dragonfly` | `cplusplus`      | `x64`, `x32`                  | `no_segfault_handler`, `no_backtrace`         |
 | `gnu`, `hpux`, `haiku`, `qnx`  |                  | `little_endian`, `big_endian` | `no_main`, `fast_math`, `apk`, `threads`      |
 | `solaris`, `termux`            |                  |                               | `js_node`, `js_browser`, `js_freestanding`    |
diff --git a/vlib/v/ast/comptime_valid_idents.v b/vlib/v/ast/comptime_valid_idents.v
index de8c48c9a1..0b405a507e 100644
--- a/vlib/v/ast/comptime_valid_idents.v
+++ b/vlib/v/ast/comptime_valid_idents.v
@@ -5,7 +5,7 @@ pub const valid_comptime_if_os = ['windows', 'ios', 'macos', 'mach', 'darwin', '
 	'haiku', 'serenity', 'vinix', 'plan9', 'wasm32_emscripten']
 pub const valid_comptime_if_compilers = ['gcc', 'tinyc', 'clang', 'mingw', 'msvc', 'cplusplus']
 pub const valid_comptime_if_platforms = ['amd64', 'i386', 'aarch64', 'arm64', 'arm32', 'rv64',
-	'rv32']
+	'rv32', 's390x']
 pub const valid_comptime_if_cpu_features = ['x64', 'x32', 'little_endian', 'big_endian']
 pub const valid_comptime_if_other = ['apk', 'js', 'debug', 'prod', 'test', 'glibc', 'prealloc',
 	'no_bounds_checking', 'freestanding', 'threads', 'js_node', 'js_browser', 'js_freestanding',