diff --git a/python/core/auto_generated/layout/qgslayoutitemlegend.sip.in b/python/core/auto_generated/layout/qgslayoutitemlegend.sip.in
index 769b53985106..acf8de6736ba 100644
--- a/python/core/auto_generated/layout/qgslayoutitemlegend.sip.in
+++ b/python/core/auto_generated/layout/qgslayoutitemlegend.sip.in
@@ -307,12 +307,17 @@ Sets the legend symbol ``width``.
     double maxSymbolSize() const;
 %Docstring
 Returns the legend maximum symbol size (in mm). 0.0 means there is no maximum set
+
+.. versionadded:: 3.16
 %End
 
     void setMaxSymbolSize( double size );
 %Docstring
 set maximum symbol size
-@param size maximum size (in mm) or 0.0 if no maximum
+
+:param size: maximum size (in mm) or 0.0 if no maximum
+
+.. versionadded:: 3.16
 %End
 
     double minSymbolSize() const;
diff --git a/python/core/auto_generated/symbology/qgssymbol.sip.in b/python/core/auto_generated/symbology/qgssymbol.sip.in
index aa23aaef811f..39e114eb9b28 100644
--- a/python/core/auto_generated/symbology/qgssymbol.sip.in
+++ b/python/core/auto_generated/symbology/qgssymbol.sip.in
@@ -1117,6 +1117,8 @@ will be scaled to maintain their current relative size to the whole symbol size.
 Sets the width units for the whole symbol (including all symbol layers).
 
 :param unit: size units
+
+.. versionadded:: 3.16
 %End
 
 
diff --git a/src/core/layout/qgslayoutitemlegend.h b/src/core/layout/qgslayoutitemlegend.h
index bd6e19507621..ee38475134fd 100644
--- a/src/core/layout/qgslayoutitemlegend.h
+++ b/src/core/layout/qgslayoutitemlegend.h
@@ -320,12 +320,14 @@ class CORE_EXPORT QgsLayoutItemLegend : public QgsLayoutItem
 
     /**
      * Returns the legend maximum symbol size (in mm). 0.0 means there is no maximum set
+     * \since QGIS 3.16
      */
     double maxSymbolSize() const;
 
     /**
-     * @brief set maximum symbol size
-     * @param size maximum size (in mm) or 0.0 if no maximum
+     * \brief set maximum symbol size
+     * \param size maximum size (in mm) or 0.0 if no maximum
+     * \since QGIS 3.16
      */
     void setMaxSymbolSize( double size );
 
diff --git a/src/core/symbology/qgssymbol.h b/src/core/symbology/qgssymbol.h
index c80c9da00b10..c124d0a36a09 100644
--- a/src/core/symbology/qgssymbol.h
+++ b/src/core/symbology/qgssymbol.h
@@ -1142,6 +1142,7 @@ class CORE_EXPORT QgsLineSymbol : public QgsSymbol
     /**
      * Sets the width units for the whole symbol (including all symbol layers).
      * \param unit size units
+     * \since QGIS 3.16
      */
     void setWidthUnit( QgsUnitTypes::RenderUnit unit );