diff --git a/mongodbatlas/resource_mongodbatlas_alert_configuration.go b/mongodbatlas/resource_mongodbatlas_alert_configuration.go
index e830ff0e9d..78576f7af4 100644
--- a/mongodbatlas/resource_mongodbatlas_alert_configuration.go
+++ b/mongodbatlas/resource_mongodbatlas_alert_configuration.go
@@ -126,23 +126,6 @@ func resourceMongoDBAtlasAlertConfiguration() *schema.Resource {
 						"units": {
 							Type:     schema.TypeString,
 							Optional: true,
-							ValidateFunc: validation.StringInSlice([]string{
-								"RAW",
-								"BITS",
-								"BYTES",
-								"KILOBITS",
-								"KILOBYTES",
-								"MEGABITS",
-								"MEGABYTES",
-								"GIGABITS",
-								"GIGABYTES",
-								"TERABYTES",
-								"PETABYTES",
-								"MILLISECONDS",
-								"SECONDS",
-								"MINUTES",
-								"HOURS",
-								"DAYS"}, false),
 						},
 						"mode": {
 							Type:     schema.TypeString,
diff --git a/website/docs/d/alert_configuration.html.markdown b/website/docs/d/alert_configuration.html.markdown
index 1040da2556..72a895cbc5 100644
--- a/website/docs/d/alert_configuration.html.markdown
+++ b/website/docs/d/alert_configuration.html.markdown
@@ -155,24 +155,7 @@ The threshold that causes an alert to be triggered. Required if `event_type_name
 
 * `threshold` - Threshold value outside of which an alert will be triggered.
 * `units` - The units for the threshold value. Depends on the type of metric.
-  Accepted values are:
-    - `RAW`
-    - `BITS`
-    - `BYTES`
-    - `KILOBITS`
-    - `KILOBYTES`
-    - `MEGABITS`
-    - `MEGABYTES`
-    - `GIGABITS`
-    - `GIGABYTES`
-    - `TERABYTES`
-    - `PETABYTES`
-    - `MILLISECONDS`
-    - `SECONDS`
-    - `MINUTES`
-    - `HOURS`
-    - `DAYS`
-
+  Refer to the [MongoDB API Alert Configuration documentation](https://www.mongodb.com/docs/atlas/reference/api/alert-configurations-get-config/#request-body-parameters) for a list of accepted values.
 * `mode` - This must be set to AVERAGE. Atlas computes the current metric value as an average.
 
 ### Threshold Config (`threshold_config`)
@@ -183,23 +166,7 @@ The threshold that causes an alert to be triggered. Required if `event_type_name
 
 * `threshold` - Threshold value outside of which an alert will be triggered.
 * `units` - The units for the threshold value. Depends on the type of metric.
-    Accepted values are:
-      - `RAW`
-      - `BITS`
-      - `BYTES`
-      - `KILOBITS`
-      - `KILOBYTES`
-      - `MEGABITS`
-      - `MEGABYTES`
-      - `GIGABITS`
-      - `GIGABYTES`
-      - `TERABYTES`
-      - `PETABYTES`
-      - `MILLISECONDS`
-      - `SECONDS`
-      - `MINUTES`
-      - `HOURS`
-      - `DAYS`
+  Refer to the [MongoDB API Alert Configuration documentation](https://www.mongodb.com/docs/atlas/reference/api/alert-configurations-get-config/#request-body-parameters) for a list of accepted values.
 
 ### Notifications
 Notifications to send when an alert condition is detected.
diff --git a/website/docs/r/alert_configuration.html.markdown b/website/docs/r/alert_configuration.html.markdown
index feed4a978d..82659073c0 100644
--- a/website/docs/r/alert_configuration.html.markdown
+++ b/website/docs/r/alert_configuration.html.markdown
@@ -178,23 +178,7 @@ The threshold that causes an alert to be triggered. Required if `event_type_name
 
 * `threshold` - Threshold value outside of which an alert will be triggered.
 * `units` - The units for the threshold value. Depends on the type of metric.
-  Accepted values are:
-    - `RAW`
-    - `BITS`
-    - `BYTES`
-    - `KILOBITS`
-    - `KILOBYTES`
-    - `MEGABITS`
-    - `MEGABYTES`
-    - `GIGABITS`
-    - `GIGABYTES`
-    - `TERABYTES`
-    - `PETABYTES`
-    - `MILLISECONDS`
-    - `SECONDS`
-    - `MINUTES`
-    - `HOURS`
-    - `DAYS`
+  Refer to the [MongoDB API Alert Configuration documentation](https://www.mongodb.com/docs/atlas/reference/api/alert-configurations-get-config/#request-body-parameters) for a list of accepted values.
 
 * `mode` - This must be set to AVERAGE. Atlas computes the current metric value as an average.
 
@@ -206,23 +190,7 @@ The threshold that causes an alert to be triggered. Required if `event_type_name
 
 * `threshold` - Threshold value outside of which an alert will be triggered.
 * `units` - The units for the threshold value. Depends on the type of metric.
-    Accepted values are:
-      - `RAW`
-      - `BITS`
-      - `BYTES`
-      - `KILOBITS`
-      - `KILOBYTES`
-      - `MEGABITS`
-      - `MEGABYTES`
-      - `GIGABITS`
-      - `GIGABYTES`
-      - `TERABYTES`
-      - `PETABYTES`
-      - `MILLISECONDS`
-      - `SECONDS`
-      - `MINUTES`
-      - `HOURS`
-      - `DAYS`
+  Refer to the [MongoDB API Alert Configuration documentation](https://www.mongodb.com/docs/atlas/reference/api/alert-configurations-get-config/#request-body-parameters) for a list of accepted values.
 
 ### Notifications
 List of notifications to send when an alert condition is detected.