diff --git a/modules/log-group/README.md b/modules/log-group/README.md
index b5a677d..1557949 100644
--- a/modules/log-group/README.md
+++ b/modules/log-group/README.md
@@ -33,7 +33,7 @@ No modules.
 | <a name="input_log_group_class"></a> [log\_group\_class](#input\_log\_group\_class) | Specified the log class of the log group. Possible values are: STANDARD or INFREQUENT\_ACCESS | `string` | `null` | no |
 | <a name="input_name"></a> [name](#input\_name) | A name for the log group | `string` | `null` | no |
 | <a name="input_name_prefix"></a> [name\_prefix](#input\_name\_prefix) | A name prefix for the log group | `string` | `null` | no |
-| <a name="input_retention_in_days"></a> [retention\_in\_days](#input\_retention\_in\_days) | Specifies the number of days you want to retain log events in the specified log group. Possible values are: 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, and 3653. | `number` | `null` | no |
+| <a name="input_retention_in_days"></a> [retention\_in\_days](#input\_retention\_in\_days) | Specifies the number of days you want to retain log events in the specified log group. Possible values are: 0, 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1096, 1827, 2192, 2557, 2922, 3288 and 3653. | `number` | `null` | no |
 | <a name="input_skip_destroy"></a> [skip\_destroy](#input\_skip\_destroy) | Set to true if you do not wish the log group (and any logs it may contain) to be deleted at destroy time, and instead just remove the log group from the Terraform state | `bool` | `null` | no |
 | <a name="input_tags"></a> [tags](#input\_tags) | A map of tags to add to Cloudwatch log group | `map(string)` | `{}` | no |
 
diff --git a/modules/log-group/variables.tf b/modules/log-group/variables.tf
index f8584b6..d743e73 100644
--- a/modules/log-group/variables.tf
+++ b/modules/log-group/variables.tf
@@ -17,13 +17,13 @@ variable "name_prefix" {
 }
 
 variable "retention_in_days" {
-  description = "Specifies the number of days you want to retain log events in the specified log group. Possible values are: 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, and 3653."
+  description = "Specifies the number of days you want to retain log events in the specified log group. Possible values are: 0, 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1096, 1827, 2192, 2557, 2922, 3288 and 3653."
   type        = number
   default     = null
 
   validation {
-    condition     = var.retention_in_days == null ? true : contains([0, 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653], var.retention_in_days)
-    error_message = "Must be 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653 or 0 (zero indicates never expire logs)."
+    condition     = var.retention_in_days == null ? true : contains([0, 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1096, 1827, 2192, 2557, 2922, 3288, 3653], var.retention_in_days)
+    error_message = "Must be 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1096, 1827, 2192, 2557, 2922, 3288, 3653 or 0 (zero indicates never expire logs)."
   }
 }