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-rw-r--r--docs/manual/mod/mpm_common.xml6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/manual/mod/mpm_common.xml b/docs/manual/mod/mpm_common.xml
index 602195335c..16ac26606b 100644
--- a/docs/manual/mod/mpm_common.xml
+++ b/docs/manual/mod/mpm_common.xml
@@ -741,6 +741,12 @@ client connections</description>
The minimum required stack size strongly depends on the modules
used, but any change in the web server configuration can invalidate
the current <directive>ThreadStackSize</directive> setting.</li>
+
+ <li>On Linux, this directive can only be used to increase the default
+ stack size, as the underlying system call uses the value as a
+ <em>minimum</em> stack size. The (often large) soft limit for
+ <code>ulimit -s</code> (8MB if unlimited) is used as the default stack
+ size.</li>
</ul>
<note>It is recommended to not reduce <directive>ThreadStackSize</directive>