diff --git a/abstract_client.cpp b/abstract_client.cpp
--- a/abstract_client.cpp
+++ b/abstract_client.cpp
@@ -718,11 +718,17 @@
         move(tx, ty);
 }
 
+/**
+ * Returns the maximum client size, not the maximum frame size.
+ */
 QSize AbstractClient::maxSize() const
 {
     return rules()->checkMaxSize(QSize(INT_MAX, INT_MAX));
 }
 
+/**
+ * Returns the minimum client size, not the minimum frame size.
+ */
 QSize AbstractClient::minSize() const
 {
     return rules()->checkMinSize(QSize(0, 0));