diff --git a/src/core/labeling/qgsvectorlayerlabelprovider.h b/src/core/labeling/qgsvectorlayerlabelprovider.h
index 1af6d47b38c..d899af01c34 100644
--- a/src/core/labeling/qgsvectorlayerlabelprovider.h
+++ b/src/core/labeling/qgsvectorlayerlabelprovider.h
@@ -107,6 +107,12 @@ class CORE_EXPORT QgsVectorLayerLabelProvider : public QgsAbstractLabelProvider
      */
     const QgsPalLayerSettings &settings() const;
 
+    /**
+     * Sets fields of this label provider. Normally this is not needed, but when used for vector tiles,
+     * fields are not known at the time of creation of label providers. It should be called before
+     * a call to prepare() which uses the list of fields.
+     * \since QGIS 3.14
+     */
     void setFields( const QgsFields &fields ) { mFields = fields; }
 
   protected:
diff --git a/src/core/vectortile/qgsvectortilebasiclabeling.h b/src/core/vectortile/qgsvectortilebasiclabeling.h
index 82ae1d683c9..e8e06cae9d9 100644
--- a/src/core/vectortile/qgsvectortilebasiclabeling.h
+++ b/src/core/vectortile/qgsvectortilebasiclabeling.h
@@ -137,7 +137,9 @@ class CORE_EXPORT QgsVectorTileBasicLabeling : public QgsVectorTileLabeling
 class QgsVectorTileBasicLabelProvider : public QgsVectorTileLabelProvider
 {
   public:
+    //! Constructs a label provider for the given vector tile layer and using styling from QgsVectorTileBasicLabeling
     QgsVectorTileBasicLabelProvider( QgsVectorTileLayer *layer, const QList<QgsVectorTileBasicLabelingStyle> &styles );
+
     QList<QgsAbstractLabelProvider *> subProviders() override;
     bool prepare( QgsRenderContext &context, QSet<QString> &attributeNames ) override;
     void registerTileFeatures( const QgsVectorTileRendererData &tile, QgsRenderContext &context ) override;
@@ -155,6 +157,7 @@ class QgsVectorTileBasicLabelProvider : public QgsVectorTileLabelProvider
     QMap<QString, QSet<QString> > mRequiredFields;
 };
 
+/// @endcond
 #endif
 
 
diff --git a/src/core/vectortile/qgsvectortilelabeling.h b/src/core/vectortile/qgsvectortilelabeling.h
index 46a50166d82..8c5ba993a50 100644
--- a/src/core/vectortile/qgsvectortilelabeling.h
+++ b/src/core/vectortile/qgsvectortilelabeling.h
@@ -33,6 +33,7 @@ class QgsVectorTileRendererData;
 class QgsVectorTileLabelProvider : public QgsVectorLayerLabelProvider
 {
   public:
+    //! Constructs base label provider class for the given vector tile layer
     explicit QgsVectorTileLabelProvider( QgsVectorTileLayer *layer );
 
     //! Returns field names for each sub-layer that are required for labeling