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-rw-r--r--sysdeps/posix/pwrite64.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/posix/pwrite64.c b/sysdeps/posix/pwrite64.c
index 7a206f6597..33446c66b5 100644
--- a/sysdeps/posix/pwrite64.c
+++ b/sysdeps/posix/pwrite64.c
@@ -22,6 +22,8 @@
 #include <errno.h>
 #include <unistd.h>
 
+/* Note: This implementation of pwrite64 is not multithread-safe.  */
+
 ssize_t
 __libc_pwrite64 (int fd, const void *buf, size_t nbyte, off64_t offset)
 {