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-rw-r--r--manual/llio.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/manual/llio.texi b/manual/llio.texi
index ceadb7ed32..fbd30a31c6 100644
--- a/manual/llio.texi
+++ b/manual/llio.texi
@@ -1153,7 +1153,8 @@ These functions are declared in @file{sys/mman.h}.
 
 The @code{mmap} function creates a new mapping, connected to bytes
 (@var{offset}) to (@var{offset} + @var{length} - 1) in the file open on
-@var{filedes}.
+@var{filedes}.  A new reference for the file specified by @var{filedes}
+is created, which is not removed by closing the file.
 
 @var{address} gives a preferred starting address for the mapping.
 @code{NULL} expresses no preference. Any previous mapping at that