diff --git a/abstract_client.h b/abstract_client.h
--- a/abstract_client.h
+++ b/abstract_client.h
@@ -630,7 +630,13 @@
     virtual void resizeWithChecks(int w, int h, ForceGeometry_t force = NormalGeometrySet) = 0;
     void resizeWithChecks(const QSize& s, ForceGeometry_t force = NormalGeometrySet);
     void keepInArea(QRect area, bool partial = false);
+    /**
+     * Returns the minimum client size, not the minimum frame size.
+     */
     virtual QSize minSize() const;
+    /**
+     * Returns the maximum client size, not the maximum frame size.
+     */
     virtual QSize maxSize() const;
     virtual void setFrameGeometry(int x, int y, int w, int h, ForceGeometry_t force = NormalGeometrySet) = 0;
     void setFrameGeometry(const QRect &rect, ForceGeometry_t force = NormalGeometrySet);