diff --git a/products/monitoring/api.yaml b/products/monitoring/api.yaml
index 90b182f83c5b..895938513e86 100644
--- a/products/monitoring/api.yaml
+++ b/products/monitoring/api.yaml
@@ -1623,6 +1623,15 @@ objects:
           name: content
           description: String or regex content to match (max 1024 bytes)
           required: true
+        - !ruby/object:Api::Type::Enum
+          name: matcher
+          description: The type of content matcher that will be applied to the server output,
+            compared to the content string when the check is run.
+          values:
+            - :CONTAINS_STRING
+            - :NOT_CONTAINS_STRING
+            - :MATCHES_REGEX
+            - :NON_MATCHES_REGEX
     - !ruby/object:Api::Type::Array
       name: selectedRegions
       description: The list of regions from which the check will be run. Some regions
diff --git a/third_party/terraform/tests/resource_monitoring_uptime_check_config_test.go b/third_party/terraform/tests/resource_monitoring_uptime_check_config_test.go
index 610d3ef75e0c..fce40ccee25b 100644
--- a/third_party/terraform/tests/resource_monitoring_uptime_check_config_test.go
+++ b/third_party/terraform/tests/resource_monitoring_uptime_check_config_test.go
@@ -106,6 +106,7 @@ resource "google_monitoring_uptime_check_config" "http" {
 
   content_matchers {
     content = "example"
+    matcher = "CONTAINS_STRING"
   }
 }
 `, suffix, path, project, pwd, host,