The default value of FlushMaxThreshold is defined as AP_FLUSH_MAX_THRESHOLD, which is 65535.

[skip ci]

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1909959 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/docs/manual/mod/core.xml b/docs/manual/mod/core.xml
index ba7e393..f50e4a8 100644
--- a/docs/manual/mod/core.xml
+++ b/docs/manual/mod/core.xml
@@ -2063,7 +2063,7 @@
 <description>Threshold above which pending data are flushed to the
 network</description>
 <syntax>FlushMaxThreshold <var>number-of-bytes</var></syntax>
-<default>FlushMaxThreshold 65536</default>
+<default>FlushMaxThreshold 65535</default>
 <contextlist><context>server config</context><context>virtual host</context>
 </contextlist>
 <compatibility>2.5 and later</compatibility>