diff --git a/src/CutAndPaste.cpp b/src/CutAndPaste.cpp
index 5dd1a55285..ecb4cbcafb 100644
--- a/src/CutAndPaste.cpp
+++ b/src/CutAndPaste.cpp
@@ -742,6 +742,9 @@ void copySelectionToStack(Cursor const & cur, CutStack & cutstack)
 		copySelectionHelper(*cur.buffer(), pars, par, cur.selEnd().pit(),
 			pos, cur.selEnd().pos(), 
 			cur.buffer()->params().documentClassPtr(), cutstack);
+
+		// Reset the dirty_tabular_stack_ flag only when something
+		// is copied to the clipboard (not to the selectionBuffer).
 		if (&cutstack == &theCuts)
 			dirtyTabularStack(false);
 	}