diff --git a/manual/filesys.texi b/manual/filesys.texi
index 5f7eb0e231..ed0e75bfd2 100644
--- a/manual/filesys.texi
+++ b/manual/filesys.texi
@@ -280,28 +280,36 @@ are defined for its value:
 
 @vtable @code
 @item DT_UNKNOWN
+@standards{BSD, dirent.h}
 The type is unknown.  Only some filesystems have full support to
 return the type of the file, others might always return this value.
 
 @item DT_REG
+@standards{BSD, dirent.h}
 A regular file.
 
 @item DT_DIR
+@standards{BSD, dirent.h}
 A directory.
 
 @item DT_FIFO
+@standards{BSD, dirent.h}
 A named pipe, or FIFO.  @xref{FIFO Special Files}.
 
 @item DT_SOCK
+@standards{BSD, dirent.h}
 A local-domain socket.  @c !!! @xref{Local Domain}.
 
 @item DT_CHR
+@standards{BSD, dirent.h}
 A character device.
 
 @item DT_BLK
+@standards{BSD, dirent.h}
 A block device.
 
 @item DT_LNK
+@standards{BSD, dirent.h}
 A symbolic link.
 @end vtable
 
@@ -865,16 +873,21 @@ file.  It can have the following values:
 
 @vtable @code
 @item FTW_F
+@standards{SVID, ftw.h}
 The item is either a normal file or a file which does not fit into one
 of the following categories.  This could be special files, sockets etc.
 @item FTW_D
+@standards{SVID, ftw.h}
 The item is a directory.
 @item FTW_NS
+@standards{SVID, ftw.h}
 The @code{stat} call failed and so the information pointed to by the
 second parameter is invalid.
 @item FTW_DNR
+@standards{SVID, ftw.h}
 The item is a directory which cannot be read.
 @item FTW_SL
+@standards{XPG4.2, ftw.h}
 The item is a symbolic link.  Since symbolic links are normally followed
 seeing this value in a @code{ftw} callback function means the referenced
 file does not exist.  The situation for @code{nftw} is different.
@@ -917,10 +930,12 @@ type.  However for the third argument some additional values are defined
 to allow finer differentiation:
 @vtable @code
 @item FTW_DP
+@standards{XPG4.2, ftw.h}
 The current item is a directory and all subdirectories have already been
 visited and reported.  This flag is returned instead of @code{FTW_D} if
 the @code{FTW_DEPTH} flag is passed to @code{nftw} (see below).
 @item FTW_SLN
+@standards{XPG4.2, ftw.h}
 The current item is a stale symbolic link.  The file it points to does
 not exist.
 @end vtable
@@ -1063,25 +1078,30 @@ is @math{0} or a bitwise-OR combination of any of the following values.
 
 @vtable @code
 @item FTW_PHYS
+@standards{XPG4.2, ftw.h}
 While traversing the directory symbolic links are not followed.  Instead
 symbolic links are reported using the @code{FTW_SL} value for the type
 parameter to the callback function.  If the file referenced by a
 symbolic link does not exist @code{FTW_SLN} is returned instead.
 @item FTW_MOUNT
+@standards{XPG4.2, ftw.h}
 The callback function is only called for items which are on the same
 mounted filesystem as the directory given by the @var{filename}
 parameter to @code{nftw}.
 @item FTW_CHDIR
+@standards{XPG4.2, ftw.h}
 If this flag is given the current working directory is changed to the
 directory of the reported object before the callback function is called.
 When @code{ntfw} finally returns the current directory is restored to
 its original value.
 @item FTW_DEPTH
+@standards{XPG4.2, ftw.h}
 If this option is specified then all subdirectories and files within
 them are processed before processing the top directory itself
 (depth-first processing).  This also means the type flag given to the
 callback function is @code{FTW_DP} and not @code{FTW_D}.
 @item FTW_ACTIONRETVAL
+@standards{GNU, ftw.h}
 If this option is specified then return values from callbacks
 are handled differently.  If the callback returns @code{FTW_CONTINUE},
 walking continues normally.  @code{FTW_STOP} means walking stops
@@ -3136,6 +3156,7 @@ writes to memory-mapped regions created with @code{mmap} can still
 result in @code{SIGBUS}.
 
 @deftypefun int posix_fallocate (int @var{fd}, off_t @var{offset}, off_t @var{length})
+@standards{POSIX.1-2001, fcntl.h}
 @safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
 @c If the file system does not support allocation,
 @c @code{posix_fallocate} has a race with file extension (if
@@ -3194,6 +3215,7 @@ allocation.  Instead, an @code{EOPNOTSUPP} is returned to the caller.
 @end deftypefun
 
 @deftypefun int posix_fallocate64 (int @var{fd}, off64_t @var{offset}, off64_t @var{length})
+@standards{POSIX.1-2001 && LFS, fcntl.h}
 @safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
 
 This function is a variant of @code{posix_fallocate64} which accepts
