diff --git a/src/unix.rs b/src/unix.rs
index 730e19e..24bec2d 100644
--- a/src/unix.rs
+++ b/src/unix.rs
@@ -24,6 +24,8 @@ pub enum Client {
     Fifo {
         file: File,
         path: PathBuf,
+        /// it can only go from false -> true but not the other way around, since that
+        ///  could cause a race condition.
         is_non_blocking: AtomicBool,
     },
 }