Refs #7724 - caching note in Manual.

extension/Documentation/Manual.rst

@@ -7608,6 +7608,9 @@ Any HTML output can be extended by a tag - that's done by the webmaster. For QFQ
 General Tips
 ============
 
+Errors
+------
+
 * Does the error happens on every *page* or only on a specific one?
 * Does the error happens on every *form* or only on a specific one?
 
@@ -7618,6 +7621,18 @@ Tips:
 	* Always check the Javascript console of your browser, see `javascriptProblem`_.
 	* Always check the Webserver log files.
 
+Caching
+-------
+
+Content, generated by QFQ, is generally not cached. But the QFQ content records are cached by Typo3. This means if there is
+a content element 'Insert Records' on a page 'A' which includes a QFQ record from page 'B' and such QFQ record is modified (the SQL
+definition, not the delivered output), the new definition becomes by default only visible if the cached is cleared.
+
+To simplify the situation, set on the page of the QFQ record (B) in Page TS Config: ::
+
+  TCEMAIN.clearCacheCmd = pages
+
+
 QFQ specific
 ------------