diff --git a/README.md b/README.md
index ef094e8c..e6798a5e 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,8 @@ mkdir my-output
 openaddr-process-one --skip-preview --layer addresses --layersource state example.json my-output
 ```
 
+Supported layer types are `addresses`, `parcels`, `buildings`, and `centerlines`.
+
 Review https://github.com/openaddresses/openaddresses/blob/master/CONTRIBUTING.md for input json syntax.
 
 Supported conform formats include `shapefile`, `geojson`, `csv`, `xml`, `gdb`, and `gpkg`.
diff --git a/openaddr/__init__.py b/openaddr/__init__.py
index b3a593cf..b3fc1098 100644
--- a/openaddr/__init__.py
+++ b/openaddr/__init__.py
@@ -23,6 +23,7 @@
     elaborate_filenames,
     ADDRESSES_SCHEMA,
     BUILDINGS_SCHEMA,
+    CENTERLINES_SCHEMA,
     PARCELS_SCHEMA,
 )
 
@@ -48,6 +49,8 @@ def __init__(self, source, layer, layersource):
             self.SCHEMA = BUILDINGS_SCHEMA
         elif self.layer == 'parcels':
             self.SCHEMA = PARCELS_SCHEMA
+        elif self.layer == 'centerlines':
+            self.SCHEMA = CENTERLINES_SCHEMA
 
 def cache(source_config, destdir, extras):
     ''' Python wrapper for openaddress-cache.
diff --git a/openaddr/conform.py b/openaddr/conform.py
index 25e123a0..cc1a29ef 100644
--- a/openaddr/conform.py
+++ b/openaddr/conform.py
@@ -49,7 +49,8 @@ def gdal_error_handler(err_class, err_num, err_msg):
 ADDRESSES_SCHEMA = [ 'hash', 'number', 'street', 'unit', 'city', 'district', 'region', 'postcode', 'id', 'accuracy' ]
 BUILDINGS_SCHEMA = [ 'hash', 'height', 'levels']
 PARCELS_SCHEMA = [ 'hash', 'pid' ]
-RESERVED_SCHEMA = ADDRESSES_SCHEMA + BUILDINGS_SCHEMA + PARCELS_SCHEMA + [
+CENTERLINES_SCHEMA = [ 'hash', 'id', 'name' ]
+RESERVED_SCHEMA = ADDRESSES_SCHEMA + BUILDINGS_SCHEMA + PARCELS_SCHEMA + CENTERLINES_SCHEMA + [
     "lat",
     "lon"
 ]
diff --git a/openaddr/process_one.py b/openaddr/process_one.py
index 06bc130a..4ed9cab3 100644
--- a/openaddr/process_one.py
+++ b/openaddr/process_one.py
@@ -106,8 +106,8 @@ def process(source, destination, layer, layersource,
                     _L.error('explicit --layersource arg is required for v2 sources')
                     raise ValueError('explicit --layersource arg is required for v2 sources')
 
-                # Only Address Layers are supported right now
-                if (layer != 'addresses' and layer != 'parcels' and layer != 'buildings'):
+                # Only these layers are supported right now
+                if layer not in ('addresses', 'parcels', 'buildings', 'centerlines'):
                     _L.error('Nothing processed: \'{}\' layer not currently supported'.format(layer))
                     raise ValueError('Nothing processed: \'{}\' layer not currently supported')
                 elif source['layers'].get(layer, None) == None: