diff --git a/.changelog/8984.txt b/.changelog/8984.txt
new file mode 100644
index 00000000000..f8924118aa6
--- /dev/null
+++ b/.changelog/8984.txt
@@ -0,0 +1,4 @@
+```release-note:bug
+compute: updated the `autoscaling_policy.mode` to accept `ONLY_SCALE_OUT` on `google_compute_autoscaler` 
+
+```
diff --git a/google/services/compute/resource_compute_autoscaler.go b/google/services/compute/resource_compute_autoscaler.go
index bd292c4c7c2..8ff939552aa 100644
--- a/google/services/compute/resource_compute_autoscaler.go
+++ b/google/services/compute/resource_compute_autoscaler.go
@@ -186,11 +186,10 @@ Stackdriver Monitoring metric. Possible values: ["GAUGE", "DELTA_PER_SECOND", "D
 							},
 						},
 						"mode": {
-							Type:         schema.TypeString,
-							Optional:     true,
-							ValidateFunc: verify.ValidateEnum([]string{"OFF", "ONLY_UP", "ON", ""}),
-							Description:  `Defines operating mode for this policy. Default value: "ON" Possible values: ["OFF", "ONLY_UP", "ON"]`,
-							Default:      "ON",
+							Type:        schema.TypeString,
+							Optional:    true,
+							Description: `Defines operating mode for this policy.`,
+							Default:     "ON",
 						},
 						"scale_in_control": {
 							Type:     schema.TypeList,
diff --git a/google/services/compute/resource_compute_region_autoscaler.go b/google/services/compute/resource_compute_region_autoscaler.go
index 4bbf0b19429..b5b0d2ba246 100644
--- a/google/services/compute/resource_compute_region_autoscaler.go
+++ b/google/services/compute/resource_compute_region_autoscaler.go
@@ -186,11 +186,10 @@ Stackdriver Monitoring metric. Possible values: ["GAUGE", "DELTA_PER_SECOND", "D
 							},
 						},
 						"mode": {
-							Type:         schema.TypeString,
-							Optional:     true,
-							ValidateFunc: verify.ValidateEnum([]string{"OFF", "ONLY_UP", "ON", ""}),
-							Description:  `Defines operating mode for this policy. Default value: "ON" Possible values: ["OFF", "ONLY_UP", "ON"]`,
-							Default:      "ON",
+							Type:        schema.TypeString,
+							Optional:    true,
+							Description: `Defines operating mode for this policy.`,
+							Default:     "ON",
 						},
 						"scale_in_control": {
 							Type:     schema.TypeList,
diff --git a/website/docs/r/compute_autoscaler.html.markdown b/website/docs/r/compute_autoscaler.html.markdown
index 57ed25d9bb2..ad0f50a2ef6 100644
--- a/website/docs/r/compute_autoscaler.html.markdown
+++ b/website/docs/r/compute_autoscaler.html.markdown
@@ -251,8 +251,6 @@ The following arguments are supported:
 * `mode` -
   (Optional)
   Defines operating mode for this policy.
-  Default value is `ON`.
-  Possible values are: `OFF`, `ONLY_UP`, `ON`.
 
 * `scale_down_control` -
   (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html))
diff --git a/website/docs/r/compute_region_autoscaler.html.markdown b/website/docs/r/compute_region_autoscaler.html.markdown
index 31403059894..348f03de786 100644
--- a/website/docs/r/compute_region_autoscaler.html.markdown
+++ b/website/docs/r/compute_region_autoscaler.html.markdown
@@ -170,8 +170,6 @@ The following arguments are supported:
 * `mode` -
   (Optional)
   Defines operating mode for this policy.
-  Default value is `ON`.
-  Possible values are: `OFF`, `ONLY_UP`, `ON`.
 
 * `scale_down_control` -
   (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html))