*) mod_http2: documentation clarification on dependency of H2HeaderStrictness on
the underlying nghttp2 version in play.
@@ -1042,7 +1042,10 @@ H2TLSCoolDownSecs 0
'rfc7540' is the original HTTP/2 RFC, 'rfc9113' is the updated version that
disallows leading and trialing spaces in fields.
</p><p>
- Use 'highest' to use always the highest strictness checks available.
+ Use 'highest' to apply the highest strictness checks available. This
+ depends on the nghttp2 library version used. 'rfc9113' is available
+ from nghttp2 v1.50.0 and onward only. When building with previous
+ versions, this setting has no effect.
</p>
</usage>
</directivesynopsis>
