diff --git a/src/header/sys_auxv/mod.rs b/src/header/sys_auxv/mod.rs
index 6c4f9ccae1..0cce21c9bc 100644
--- a/src/header/sys_auxv/mod.rs
+++ b/src/header/sys_auxv/mod.rs
@@ -1,9 +1,12 @@
-//! sys/auxv.h implementation
+//! `sys/auxv.h` implementation.
+//!
+//! Non-POSIX, see <https://www.man7.org/linux/man-pages/man3/getauxval.3.html>.
 
 use crate::platform::types::*;
 
 pub use crate::platform::auxv_defs::*;
 
+/// See <https://www.man7.org/linux/man-pages/man3/getauxval.3.html>.
 #[no_mangle]
 pub extern "C" fn getauxval(_t: c_ulong) -> c_ulong {
     0