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-rw-r--r--doc/src/sgml/config.sgml4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 2988865b116..4fd377d1c5f 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2638,6 +2638,8 @@ include_dir 'conf.d'
This parameter can only be set in
the <filename>postgresql.conf</filename> file or on the server
command line.
+ The maximum possible size depends on the operating system and block
+ size, but is typically 1MB on Unix and 128kB on Windows.
The default is 128kB.
</para>
</listitem>
@@ -2655,6 +2657,8 @@ include_dir 'conf.d'
higher than the <varname>io_max_combine_limit</varname> parameter, the
lower value will silently be used instead, so both may need to be raised
to increase the I/O size.
+ The maximum possible size depends on the operating system and block
+ size, but is typically 1MB on Unix and 128kB on Windows.
The default is 128kB.
</para>
</listitem>