diff --git a/google/cloud/optimization_v1/services/fleet_routing/async_client.py b/google/cloud/optimization_v1/services/fleet_routing/async_client.py
index 02c0e5b..0b80ec9 100644
--- a/google/cloud/optimization_v1/services/fleet_routing/async_client.py
+++ b/google/cloud/optimization_v1/services/fleet_routing/async_client.py
@@ -248,6 +248,13 @@ async def optimize_tours(
 
         .. code-block:: python
 
+            # This snippet has been automatically generated and should be regarded as a
+            # code template only.
+            # It will require modifications to work:
+            # - It may require correct/in-range values for request initialization.
+            # - It may require specifying regional endpoints when creating the service
+            #   client as shown in:
+            #   https://googleapis.dev/python/google-api-core/latest/client_options.html
             from google.cloud import optimization_v1
 
             async def sample_optimize_tours():
@@ -344,6 +351,13 @@ async def batch_optimize_tours(
 
         .. code-block:: python
 
+            # This snippet has been automatically generated and should be regarded as a
+            # code template only.
+            # It will require modifications to work:
+            # - It may require correct/in-range values for request initialization.
+            # - It may require specifying regional endpoints when creating the service
+            #   client as shown in:
+            #   https://googleapis.dev/python/google-api-core/latest/client_options.html
             from google.cloud import optimization_v1
 
             async def sample_batch_optimize_tours():
diff --git a/google/cloud/optimization_v1/services/fleet_routing/client.py b/google/cloud/optimization_v1/services/fleet_routing/client.py
index 35cb358..bf9721e 100644
--- a/google/cloud/optimization_v1/services/fleet_routing/client.py
+++ b/google/cloud/optimization_v1/services/fleet_routing/client.py
@@ -455,6 +455,13 @@ def optimize_tours(
 
         .. code-block:: python
 
+            # This snippet has been automatically generated and should be regarded as a
+            # code template only.
+            # It will require modifications to work:
+            # - It may require correct/in-range values for request initialization.
+            # - It may require specifying regional endpoints when creating the service
+            #   client as shown in:
+            #   https://googleapis.dev/python/google-api-core/latest/client_options.html
             from google.cloud import optimization_v1
 
             def sample_optimize_tours():
@@ -543,6 +550,13 @@ def batch_optimize_tours(
 
         .. code-block:: python
 
+            # This snippet has been automatically generated and should be regarded as a
+            # code template only.
+            # It will require modifications to work:
+            # - It may require correct/in-range values for request initialization.
+            # - It may require specifying regional endpoints when creating the service
+            #   client as shown in:
+            #   https://googleapis.dev/python/google-api-core/latest/client_options.html
             from google.cloud import optimization_v1
 
             def sample_batch_optimize_tours():
diff --git a/mypy.ini b/mypy.ini
index 4505b48..574c5ae 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1,3 +1,3 @@
 [mypy]
-python_version = 3.6
+python_version = 3.7
 namespace_packages = True
diff --git a/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_batch_optimize_tours_async.py b/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_batch_optimize_tours_async.py
index e9df651..bca0e3f 100644
--- a/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_batch_optimize_tours_async.py
+++ b/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_batch_optimize_tours_async.py
@@ -24,6 +24,13 @@
 
 
 # [START cloudoptimization_v1_generated_FleetRouting_BatchOptimizeTours_async]
+# This snippet has been automatically generated and should be regarded as a
+# code template only.
+# It will require modifications to work:
+# - It may require correct/in-range values for request initialization.
+# - It may require specifying regional endpoints when creating the service
+#   client as shown in:
+#   https://googleapis.dev/python/google-api-core/latest/client_options.html
 from google.cloud import optimization_v1
 
 
diff --git a/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_batch_optimize_tours_sync.py b/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_batch_optimize_tours_sync.py
index 1fa4c3e..7750123 100644
--- a/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_batch_optimize_tours_sync.py
+++ b/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_batch_optimize_tours_sync.py
@@ -24,6 +24,13 @@
 
 
 # [START cloudoptimization_v1_generated_FleetRouting_BatchOptimizeTours_sync]
+# This snippet has been automatically generated and should be regarded as a
+# code template only.
+# It will require modifications to work:
+# - It may require correct/in-range values for request initialization.
+# - It may require specifying regional endpoints when creating the service
+#   client as shown in:
+#   https://googleapis.dev/python/google-api-core/latest/client_options.html
 from google.cloud import optimization_v1
 
 
diff --git a/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_optimize_tours_async.py b/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_optimize_tours_async.py
index 973e6c1..1ff26eb 100644
--- a/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_optimize_tours_async.py
+++ b/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_optimize_tours_async.py
@@ -24,6 +24,13 @@
 
 
 # [START cloudoptimization_v1_generated_FleetRouting_OptimizeTours_async]
+# This snippet has been automatically generated and should be regarded as a
+# code template only.
+# It will require modifications to work:
+# - It may require correct/in-range values for request initialization.
+# - It may require specifying regional endpoints when creating the service
+#   client as shown in:
+#   https://googleapis.dev/python/google-api-core/latest/client_options.html
 from google.cloud import optimization_v1
 
 
diff --git a/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_optimize_tours_sync.py b/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_optimize_tours_sync.py
index b3352d1..a0e4335 100644
--- a/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_optimize_tours_sync.py
+++ b/samples/generated_samples/cloudoptimization_v1_generated_fleet_routing_optimize_tours_sync.py
@@ -24,6 +24,13 @@
 
 
 # [START cloudoptimization_v1_generated_FleetRouting_OptimizeTours_sync]
+# This snippet has been automatically generated and should be regarded as a
+# code template only.
+# It will require modifications to work:
+# - It may require correct/in-range values for request initialization.
+# - It may require specifying regional endpoints when creating the service
+#   client as shown in:
+#   https://googleapis.dev/python/google-api-core/latest/client_options.html
 from google.cloud import optimization_v1
 
 
diff --git a/samples/generated_samples/snippet_metadata_optimization_v1.json b/samples/generated_samples/snippet_metadata_optimization_v1.json
index c35e77d..777350b 100644
--- a/samples/generated_samples/snippet_metadata_optimization_v1.json
+++ b/samples/generated_samples/snippet_metadata_optimization_v1.json
@@ -55,33 +55,33 @@
       "regionTag": "cloudoptimization_v1_generated_FleetRouting_BatchOptimizeTours_async",
       "segments": [
         {
-          "end": 53,
+          "end": 60,
           "start": 27,
           "type": "FULL"
         },
         {
-          "end": 53,
+          "end": 60,
           "start": 27,
           "type": "SHORT"
         },
         {
-          "end": 33,
-          "start": 31,
+          "end": 40,
+          "start": 38,
           "type": "CLIENT_INITIALIZATION"
         },
         {
-          "end": 43,
-          "start": 34,
+          "end": 50,
+          "start": 41,
           "type": "REQUEST_INITIALIZATION"
         },
         {
-          "end": 50,
-          "start": 44,
+          "end": 57,
+          "start": 51,
           "type": "REQUEST_EXECUTION"
         },
         {
-          "end": 54,
-          "start": 51,
+          "end": 61,
+          "start": 58,
           "type": "RESPONSE_HANDLING"
         }
       ],
@@ -131,33 +131,33 @@
       "regionTag": "cloudoptimization_v1_generated_FleetRouting_BatchOptimizeTours_sync",
       "segments": [
         {
-          "end": 53,
+          "end": 60,
           "start": 27,
           "type": "FULL"
         },
         {
-          "end": 53,
+          "end": 60,
           "start": 27,
           "type": "SHORT"
         },
         {
-          "end": 33,
-          "start": 31,
+          "end": 40,
+          "start": 38,
           "type": "CLIENT_INITIALIZATION"
         },
         {
-          "end": 43,
-          "start": 34,
+          "end": 50,
+          "start": 41,
           "type": "REQUEST_INITIALIZATION"
         },
         {
-          "end": 50,
-          "start": 44,
+          "end": 57,
+          "start": 51,
           "type": "REQUEST_EXECUTION"
         },
         {
-          "end": 54,
-          "start": 51,
+          "end": 61,
+          "start": 58,
           "type": "RESPONSE_HANDLING"
         }
       ],
@@ -208,33 +208,33 @@
       "regionTag": "cloudoptimization_v1_generated_FleetRouting_OptimizeTours_async",
       "segments": [
         {
-          "end": 44,
+          "end": 51,
           "start": 27,
           "type": "FULL"
         },
         {
-          "end": 44,
+          "end": 51,
           "start": 27,
           "type": "SHORT"
         },
         {
-          "end": 33,
-          "start": 31,
+          "end": 40,
+          "start": 38,
           "type": "CLIENT_INITIALIZATION"
         },
         {
-          "end": 38,
-          "start": 34,
+          "end": 45,
+          "start": 41,
           "type": "REQUEST_INITIALIZATION"
         },
         {
-          "end": 41,
-          "start": 39,
+          "end": 48,
+          "start": 46,
           "type": "REQUEST_EXECUTION"
         },
         {
-          "end": 45,
-          "start": 42,
+          "end": 52,
+          "start": 49,
           "type": "RESPONSE_HANDLING"
         }
       ],
@@ -284,33 +284,33 @@
       "regionTag": "cloudoptimization_v1_generated_FleetRouting_OptimizeTours_sync",
       "segments": [
         {
-          "end": 44,
+          "end": 51,
           "start": 27,
           "type": "FULL"
         },
         {
-          "end": 44,
+          "end": 51,
           "start": 27,
           "type": "SHORT"
         },
         {
-          "end": 33,
-          "start": 31,
+          "end": 40,
+          "start": 38,
           "type": "CLIENT_INITIALIZATION"
         },
         {
-          "end": 38,
-          "start": 34,
+          "end": 45,
+          "start": 41,
           "type": "REQUEST_INITIALIZATION"
         },
         {
-          "end": 41,
-          "start": 39,
+          "end": 48,
+          "start": 46,
           "type": "REQUEST_EXECUTION"
         },
         {
-          "end": 45,
-          "start": 42,
+          "end": 52,
+          "start": 49,
           "type": "RESPONSE_HANDLING"
         }
       ],