diff --git a/aws/resource_aws_lightsail_instance_test.go b/aws/resource_aws_lightsail_instance_test.go
index c3caf10a3a4..b3aed97fdb1 100644
--- a/aws/resource_aws_lightsail_instance_test.go
+++ b/aws/resource_aws_lightsail_instance_test.go
@@ -161,7 +161,7 @@ func TestAccAWSLightsailInstance_Tags(t *testing.T) {
 					resource.TestCheckResourceAttrSet("aws_lightsail_instance.lightsail_instance_test", "blueprint_id"),
 					resource.TestCheckResourceAttrSet("aws_lightsail_instance.lightsail_instance_test", "bundle_id"),
 					resource.TestCheckResourceAttrSet("aws_lightsail_instance.lightsail_instance_test", "key_pair_name"),
-					resource.TestCheckResourceAttr("aws_lightsail_instance.lightsail_instance_test", "tags.%", "1"),
+					resource.TestCheckResourceAttr("aws_lightsail_instance.lightsail_instance_test", "tags.%", "2"),
 				),
 			},
 			{
@@ -172,7 +172,7 @@ func TestAccAWSLightsailInstance_Tags(t *testing.T) {
 					resource.TestCheckResourceAttrSet("aws_lightsail_instance.lightsail_instance_test", "blueprint_id"),
 					resource.TestCheckResourceAttrSet("aws_lightsail_instance.lightsail_instance_test", "bundle_id"),
 					resource.TestCheckResourceAttrSet("aws_lightsail_instance.lightsail_instance_test", "key_pair_name"),
-					resource.TestCheckResourceAttr("aws_lightsail_instance.lightsail_instance_test", "tags.%", "2"),
+					resource.TestCheckResourceAttr("aws_lightsail_instance.lightsail_instance_test", "tags.%", "3"),
 				),
 			},
 		},
@@ -331,6 +331,7 @@ resource "aws_lightsail_instance" "lightsail_instance_test" {
 
   tags = {
     Name = "tf-test"
+    KeyOnlyTag = ""
   }
 }
 `, lightsailName)
@@ -354,8 +355,9 @@ resource "aws_lightsail_instance" "lightsail_instance_test" {
   bundle_id         = "nano_1_0"
 
   tags = {
-    Name      = "tf-test",
-    ExtraName = "tf-test"
+    Name       = "tf-test",
+    KeyOnlyTag = ""
+    ExtraName  = "tf-test"
   }
 }
 `, lightsailName)
diff --git a/website/docs/r/lightsail_instance.html.markdown b/website/docs/r/lightsail_instance.html.markdown
index 16b3cc88964..62cb4341831 100644
--- a/website/docs/r/lightsail_instance.html.markdown
+++ b/website/docs/r/lightsail_instance.html.markdown
@@ -43,7 +43,7 @@ instance (see list below)
 * `key_pair_name` - (Optional) The name of your key pair. Created in the
 Lightsail console (cannot use `aws_key_pair` at this time)
 * `user_data` - (Optional) launch script to configure server with additional user data
-* `tags` - (Optional) A map of tags to assign to the resource.
+* `tags` - (Optional) A map of tags to assign to the resource. To create a key-only tag, use an empty string as the value.
 
 ## Availability Zones
 Lightsail currently supports the following Availability Zones (e.g. `us-east-1a`):