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-rw-r--r--library/std/src/sys/pal/windows/thread.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/library/std/src/sys/pal/windows/thread.rs b/library/std/src/sys/pal/windows/thread.rs
index 601ba095aa4..970bd9c6ce7 100644
--- a/library/std/src/sys/pal/windows/thread.rs
+++ b/library/std/src/sys/pal/windows/thread.rs
@@ -26,6 +26,8 @@ impl Thread {
     pub unsafe fn new(stack: usize, p: Box<dyn FnOnce()>) -> io::Result<Thread> {
         let p = Box::into_raw(Box::new(p));
 
+        // CreateThread rounds up values for the stack size to the nearest page size (at least 4kb).
+        // If a value of zero is given then the default stack size is used instead.
         let ret = c::CreateThread(
             ptr::null_mut(),
             stack,