diff --git a/src/header/sys_select/mod.rs b/src/header/sys_select/mod.rs
index 2ffc823c1c..8124f211a9 100644
--- a/src/header/sys_select/mod.rs
+++ b/src/header/sys_select/mod.rs
@@ -1,4 +1,6 @@
-//! sys/select.h implementation
+//! `sys/select.h` implementation.
+//!
+//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_select.h.html>.
 
 use core::mem;
 
@@ -14,14 +16,16 @@ use crate::{
         },
         sys_time::timeval,
     },
-    platform::{self, types::*},
+    platform::{self, types::c_int},
 };
 
 // fd_set is also defined in C because cbindgen is incompatible with mem::size_of booo
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_select.h.html>.
 pub const FD_SETSIZE: usize = 1024;
 type bitset = BitSet<[u64; FD_SETSIZE / (8 * mem::size_of::<u64>())]>;
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_select.h.html>.
 #[repr(C)]
 pub struct fd_set {
     pub fds_bits: bitset,
@@ -161,6 +165,7 @@ pub fn select_epoll(
     count
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/pselect.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn select(
     nfds: c_int,
diff --git a/src/header/sys_utsname/mod.rs b/src/header/sys_utsname/mod.rs
index 2ca93e38b5..8751727430 100644
--- a/src/header/sys_utsname/mod.rs
+++ b/src/header/sys_utsname/mod.rs
@@ -1,13 +1,19 @@
-//! sys/utsname implementation, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/sysutsname.h.html
+//! `sys/utsname.h` implementation.
+//!
+//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_utsname.h.html>.
 
 use crate::{
     error::ResultExt,
     out::Out,
-    platform::{Pal, Sys, types::*},
+    platform::{
+        Pal, Sys,
+        types::{c_char, c_int},
+    },
 };
 
 pub const UTSLENGTH: usize = 65;
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_utsname.h.html>.
 #[repr(C)]
 #[derive(Clone, Copy, Debug, OutProject)]
 pub struct utsname {
@@ -19,6 +25,7 @@ pub struct utsname {
     pub domainname: [c_char; UTSLENGTH],
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/uname.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn uname(uts: *mut utsname) -> c_int {
     Sys::uname(Out::nonnull(uts))