2 files changed, 4 insertions, 1 deletions

diff --git a/include/platform.h b/include/platform.h
index d2c1f9d20..0f2f83a7d 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -350,7 +350,9 @@ static ALWAYS_INLINE char* strchrnul(const char *s, char c)
 #ifndef MS_SHARED
 #define MS_SHARED      (1<<20)
 #endif
-
+#ifndef MS_RELATIME
+#define MS_RELATIME   (1 << 21)
+#endif
 
 #if !defined(BLKSSZGET)
 #define BLKSSZGET _IO(0x12, 104)
diff --git a/include/usage.h b/include/usage.h
index 78f40367e..e24299088 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -2661,6 +2661,7 @@
        "        [a]sync         Writes are asynchronous / synchronous\n" \
        "        [no]atime       Disable / enable updates to inode access times\n" \
        "        [no]diratime    Disable / enable atime updates to directories\n" \
+       "        [no]relatime    Disable / enable atime updates relative to modification time\n" \
        "        [no]dev         Allow use of special device files / disallow them\n" \
        "        [no]exec        Allow use of executable files / disallow them\n" \
        "        [no]suid        Allow set-user-id-root programs / disallow them\n" \