diff --git a/build/tools/build-wxwidgets.py b/build/tools/build-wxwidgets.py
index eec9109856..0695795828 100755
--- a/build/tools/build-wxwidgets.py
+++ b/build/tools/build-wxwidgets.py
@@ -266,12 +266,11 @@ def main(scriptName, args):
             wxpy_configure_opts.append("--with-sdl")
             wxpy_configure_opts.append("--with-gnomeprint")
                                         
-        # Ensure that the Carbon build stays compatible back to 10.4 and
-        # for the Cocoa build allow running on 10.5 and newer.  We only add
-        # them to the wxpy options because this is a hard-requirement for
-        # wxPython, but other cases it is optional and is left up to the
-        # developer.  TODO: there should be a command line option to set
-        # the SDK...
+        # Try to use use lowest available SDK back to 10.5. Both Carbon and
+        # Cocoa builds require at least the 10.5 SDK now. We only add it to
+        # the wxpy options because this is a hard-requirement for wxPython,
+        # but other cases it is optional and is left up to the developer.
+        # TODO: there should be a command line option to set the SDK...
         if sys.platform.startswith("darwin"):
             xcodePath = getXcodePath()
             sdks = [