diff --git a/overviewer_core/settingsDefinition.py b/overviewer_core/settingsDefinition.py
index 54fb763..dc8a518 100644
--- a/overviewer_core/settingsDefinition.py
+++ b/overviewer_core/settingsDefinition.py
@@ -79,6 +79,7 @@ renders = Setting(required=True, default=util.OrderedDict(),
             "crop": Setting(required=False, validator=validateCrop, default=None),
             "changelist": Setting(required=False, validator=validateStr, default=None),
             "markers": Setting(required=False, validator=validateMarkers, default=[]),
+            "overlay": Setting(required=False, validator=validateOverlays, default=[]),
 
             # Remove this eventually (once people update their configs)
             "worldname": Setting(required=False, default=None,
diff --git a/overviewer_core/settingsValidators.py b/overviewer_core/settingsValidators.py
index d8846b1..7b023a8 100644
--- a/overviewer_core/settingsValidators.py
+++ b/overviewer_core/settingsValidators.py
@@ -51,6 +51,13 @@ def validateMarkers(filterlist):
             raise ValidationException("%r must be a function"% x)
     return filterlist
 
+def validateOverlays(renderlist):
+    if type(renderlist) != list:
+        raise ValidationException("Overlay must specify a list of renders")
+    for x in renderlist:
+        print x
+    return renderlist
+
 def validateWorldPath(worldpath):
     _, worldpath = checkBadEscape(worldpath)
     abs_path = os.path.abspath(os.path.expanduser(worldpath))