diff --git a/man2/madvise.2 b/man2/madvise.2
index 638851ba4..dbe1deca1 100644
--- a/man2/madvise.2
+++ b/man2/madvise.2
@@ -146,6 +146,7 @@ error
 .\" bufferpool (shared memory segments) - without writing back to
 .\" disk/swap space.  This feature is also useful for supporting
 .\" hot-plug memory on UML.
+The specified address range must be mapped shared and writable.
 This flag cannot be applied to locked pages or Huge TLB pages.
 .TP
 .BR MADV_DONTFORK " (since Linux 2.6.16)"
@@ -324,6 +325,12 @@ On error, it returns \-1 and
 is set appropriately.
 .SH ERRORS
 .TP
+.B EACCES
+.I advice
+is
+.BR MADV_REMOVE ,
+but the specified address range is not a shared writable mapping.
+.TP
 .B EAGAIN
 A kernel resource was temporarily unavailable.
 .TP