diff --git a/src/corelib/tools/qpoint.cpp b/src/corelib/tools/qpoint.cpp
index dc2a2d97399205b409b5c382518164a1c444c9d3..94a245375bb1d83e6c3c68682d0ef67f7dfdcaec 100644
--- a/src/corelib/tools/qpoint.cpp
+++ b/src/corelib/tools/qpoint.cpp
@@ -528,12 +528,8 @@ QDebug operator<<(QDebug dbg, const QPointF &p)
 /*!
     \fn bool QPointF::isNull() const
 
-    Returns \c true if both the x and y coordinates are set to +0.0;
-    otherwise returns \c false.
-
-    \note Since this function treats +0.0 and -0.0 differently, points
-    with zero-valued coordinates where either or both values have a
-    negative sign are not defined to be null points.
+    Returns \c true if both the x and y coordinates are set to 0.0 (ignoring
+    the sign); otherwise returns \c false.
 */
 
 
diff --git a/src/corelib/tools/qsize.cpp b/src/corelib/tools/qsize.cpp
index 19227432f256a02118ef585143eb3dd29a17a767..24a29f021339854c807f8ab4047f43d31736cf81 100644
--- a/src/corelib/tools/qsize.cpp
+++ b/src/corelib/tools/qsize.cpp
@@ -517,12 +517,8 @@ QDebug operator<<(QDebug dbg, const QSize &s)
 /*!
     \fn bool QSizeF::isNull() const
 
-    Returns \c true if both the width and height are +0.0; otherwise returns
-    false.
-
-    \note Since this function treats +0.0 and -0.0 differently, sizes with
-    zero width and height where either or both values have a negative
-    sign are not defined to be null sizes.
+    Returns \c true if both the width and height are 0.0 (ignoring the sign);
+    otherwise returns \c false.
 
     \sa isValid(), isEmpty()
 */