diff --git a/src/corelib/tools/qcollator.cpp b/src/corelib/tools/qcollator.cpp
index 59f8f66869..bbe2e28ea8 100644
--- a/src/corelib/tools/qcollator.cpp
+++ b/src/corelib/tools/qcollator.cpp
@@ -248,6 +248,8 @@ bool QCollator::numericMode() const
 
     The default is locale dependent.
 
+    \note This method is not currently supported on Apple platforms or if Qt is configured to not use ICU on Linux.
+
     \sa ignorePunctuation()
  */
 void QCollator::setIgnorePunctuation(bool on)