diff --git a/man7/system_data_types.7 b/man7/system_data_types.7
index d2a271a3b..7f3309517 100644
--- a/man7/system_data_types.7
+++ b/man7/system_data_types.7
@@ -726,6 +726,38 @@ C99 and later; POSIX.1-2001 and later.
 .IR "See also" :
 .BR lldiv (3)
 .RE
+.\"------------------------------------- off64_t ----------------------/
+.TP
+.I off64_t
+.RS
+.IR Include :
+.IR <sys/types.h> .
+.PP
+Used for file sizes.
+It is a 64-bit signed integer type.
+.PP
+.IR "Conforming to" :
+Present in glibc.
+It is not standardized by the C language standard nor POSIX.
+.PP
+.IR Notes :
+The feature test macro
+.B _LARGEFILE64_SOURCE
+has to be defined for this type to be available.
+.PP
+.IR "See also" :
+.BR copy_file_range (2),
+.BR readahead (2),
+.BR sync_file_range (2),
+.BR lseek64 (3),
+.BR feature_test_macros (7)
+.PP
+See also the
+.\" .I loff_t
+.\" and
+.I off_t
+type in this page.
+.RE
 .\"------------------------------------- off_t ------------------------/
 .TP
 .I off_t
@@ -775,12 +807,12 @@ the width of this type can be controlled with the feature test macro
 .BR lockf (3),
 .BR posix_fallocate (3),
 .BR feature_test_macros (7)
-.\".PP		TODO: loff_t, off64_t
-.\"See also the
-.\".I loff_t
-.\"and
-.\".I off64_t
-.\"types in this page.
+.PP
+See also the
+.\" .I loff_t
+.\" and
+.I off64_t
+type in this page.
 .RE
 .\"------------------------------------- pid_t ------------------------/
 .TP