diff --git a/src/models/collapsestateproxymodel.h b/src/models/collapsestateproxymodel.h
index 35447c80b..3b868bcd9 100644
--- a/src/models/collapsestateproxymodel.h
+++ b/src/models/collapsestateproxymodel.h
@@ -6,26 +6,58 @@
 #include "messageeventmodel.h"
 #include <QSortFilterProxyModel>
 
+/**
+ * @class CollapseStateProxyModel
+ *
+ * This model aggregates multiple sequential state events into a single entry.
+ *
+ * Events are only aggregated if they happened on the same day.
+ *
+ * @sa MessageEventModel
+ */
 class CollapseStateProxyModel : public QSortFilterProxyModel
 {
     Q_OBJECT
 public:
+    /**
+     * @brief Defines the model roles.
+     */
     enum Roles {
-        AggregateDisplayRole = MessageEventModel::LastRole + 1,
-        StateEventsRole,
-        AuthorListRole,
+        AggregateDisplayRole = MessageEventModel::LastRole + 1, /**< Single line aggregation of all the state events. */
+        StateEventsRole, /**< List of state events in the aggregated state. */
+        AuthorListRole, /**< List of unique authors of the aggregated state event. */
     };
+
+    /**
+     * @brief Whether a row should be shown out or not.
+     *
+     * @sa QSortFilterProxyModel::filterAcceptsRow
+     */
     [[nodiscard]] bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
-    [[nodiscard]] QHash<int, QByteArray> roleNames() const override;
+
+    /**
+     * @brief Get the given role value at the given index.
+     *
+     * @sa QSortFilterProxyModel::data
+     */
     [[nodiscard]] QVariant data(const QModelIndex &idx, int role = Qt::DisplayRole) const override;
 
     /**
-     * @brief QString aggregating the text of consecutive state events starting at row.
+     * @brief Returns a mapping from Role enum values to role names.
+     *
+     * @sa Roles, QAbstractProxyModel::roleNames()
+     */
+    [[nodiscard]] QHash<int, QByteArray> roleNames() const override;
+
+private:
+    /**
+     * @brief Aggregation of the text of consecutive state events starting at row.
      *
      * If state events happen on different days they will be split into two aggregate
      * events.
      */
     [[nodiscard]] QString aggregateEventToString(int row) const;
+
     /**
      * @brief Return a list of consecutive state events starting at row.
      *
@@ -33,6 +65,7 @@ public:
      * events.
      */
     [[nodiscard]] QVariantList stateEventsList(int row) const;
+
     /**
      * @brief List of unique authors for the aggregate state events starting at row.
      */