1 files changed, 5 insertions, 0 deletions
diff --git a/src/lib9/pipe.c b/src/lib9/pipe.c
index f9fe2420..01b244ef 100644
--- a/src/lib9/pipe.c
+++ b/src/lib9/pipe.c
@@ -3,6 +3,11 @@
 #include <libc.h>
 #include <sys/socket.h>
 
+/*
+ * We use socketpair to get a two-way pipe.
+ * The pipe still doesn't preserve message boundaries.
+ * Worse, it cannot be reopened via /dev/fd/NNN on Linux.
+ */
 int
 p9pipe(int fd[2])
 {