diff --git a/azurerm/helpers/validate/web_application_firewall_policy.go b/azurerm/helpers/validate/web_application_firewall_policy.go
index da86db47f952..a7945b91dcdc 100644
--- a/azurerm/helpers/validate/web_application_firewall_policy.go
+++ b/azurerm/helpers/validate/web_application_firewall_policy.go
@@ -28,6 +28,7 @@ var ValidateWebApplicationFirewallPolicyRuleGroupName = validation.StringInSlice
 }, false)
 
 var ValidateWebApplicationFirewallPolicyRuleSetVersion = validation.StringInSlice([]string{
+	"0.1",
 	"1.0",
 	"2.2.9",
 	"3.0",
diff --git a/website/docs/r/web_application_firewall_policy.html.markdown b/website/docs/r/web_application_firewall_policy.html.markdown
index 4c5d17f2d59b..b6232194ed34 100644
--- a/website/docs/r/web_application_firewall_policy.html.markdown
+++ b/website/docs/r/web_application_firewall_policy.html.markdown
@@ -185,9 +185,9 @@ The `exclusion` block supports the following:
 
 The `managed_rule_set` block supports the following:
 
-* `type` - (Optional) The rule set type.
+* `type` - (Optional) The rule set type. Possible values: `Microsoft_BotManagerRuleSet` and `OWASP`.
 
-* `version` - (Required) The rule set version.
+* `version` - (Required) The rule set version. Possible values: `0.1`, `1.0`, `2.2.9`, `3.0` and `3.1`.
 
 * `rule_group_override` - (Optional) One or more `rule_group_override` block defined below.