Update documentation

docs/source/usage/advanced_formatting.rst

@@ -56,6 +56,20 @@ activated by clicking the left-most icon button in the editor header.
 .. versionadded:: 2.2
 
 
+.. _docs_usage_formatting_shortcodes_break:
+
+Forced Line Break
+-----------------
+
+Inserting ``[br]`` in the text will ensure a line break is always inserted in that place, even if
+you turn off **Preserve Hard Line breaks** in your **Manuscript Build Settings**.
+
+You can add a manual line break after it too, for a better visual representation in the editor, but
+keep in mind that this line break is removed before the text is processed, so the text on either
+side will be considered as belonging to the same line. This can affect how alignment is treated.
+See :ref:`docs_usage_align_indent_forced` for more details.
+
+
 .. _docs_usage_formatting_breaks:
 
 Vertical Space and Page Breaks