diff --git a/docs/gallery/general/extensions.py b/docs/gallery/general/extensions.py
index ddf9159c7..3e41e7a91 100644
--- a/docs/gallery/general/extensions.py
+++ b/docs/gallery/general/extensions.py
@@ -37,8 +37,7 @@
 ns_builder = NWBNamespaceBuilder(
     "Extension for use in my Lab", "mylab", version="0.1.0"
 )
-
-ns_builder.include_type("ElectricalSeries", namespace="core")
+ns_builder.include_namespace("core")
 
 ext = NWBGroupSpec(
     "A custom ElectricalSeries for my lab",
@@ -264,7 +263,7 @@ def __init__(self, **kwargs):
 ext_source = name + ".extensions.yaml"
 
 ns_builder = NWBNamespaceBuilder(name + " extensions", name, version="0.1.0")
-ns_builder.include_type("NWBDataInterface", namespace="core")
+ns_builder.include_namespace("core")
 
 potato = NWBGroupSpec(
     neurodata_type_def="Potato",
diff --git a/test.py b/test.py
index d00a0d07c..721cd803f 100644
--- a/test.py
+++ b/test.py
@@ -169,7 +169,8 @@ def validate_nwbs():
                 is_family_nwb_file = False
                 try:
                     with pynwb.NWBHDF5IO(nwb, mode='r') as io:
-                        errors = validate(io, use_cached_namespaces=False)  # previously io did not validate against cached namespaces
+                        errors = validate(io, use_cached_namespaces=False)
+                        errors.extend(validate(io, use_cached_namespaces=True))
                 except OSError as e:
                     # if the file was created with the family driver, need to use the family driver to open it
                     if 'family driver should be used' in str(e):
@@ -180,6 +181,7 @@ def validate_nwbs():
                         with h5py.File(filename_pattern, mode='r', driver='family', memb_size=memb_size) as f:
                             with pynwb.NWBHDF5IO(file=f, manager=None, mode='r') as io:
                                 errors = validate(io, use_cached_namespaces=False)
+                                errors.extend(validate(io, use_cached_namespaces=True))
                     else:
                         raise e