diff --git a/modules/alias/README.md b/modules/alias/README.md
index 5ee31171..be12e936 100644
--- a/modules/alias/README.md
+++ b/modules/alias/README.md
@@ -1,15 +1,15 @@
 # AWS Lambda Alias
 
-Terraform module, which creates Lambda alias as well as takes care of async event configuration and Lambda permissions for alias.
+Terraform module, which creates a Lambda alias as well as takes care of async event configuration and Lambda permissions for the alias.
 
-Lambda Alias is required to do complex Lambda deployments, eg. using external tools like AWS CodeDeploy.
+Lambda Alias is required to do complex Lambda deployments, e.g., using external tools like AWS CodeDeploy.
 
-This Terraform module is the part of [serverless.tf framework](https://github.com/antonbabenko/serverless.tf), which aims to simplify all operations when working with the serverless in Terraform.
+This Terraform module is part of [serverless.tf framework](https://github.com/antonbabenko/serverless.tf), which aims to simplify all operations when working with serverless in Terraform.
 
 
 ## Usage
 
-### Lambda Function and statically configured alias with the version of Lambda Function
+### Lambda Function and statically configured alias with the version of the Lambda Function
 
 ```hcl
 module "lambda_function" {
@@ -43,7 +43,7 @@ module "alias_no_refresh" {
 
 ### Lambda Alias (auto-refreshing when version changed externally)
 
-This is useful when doing complex deployments using external tool.
+This is useful when doing complex deployments using an external tool.
 
 ```hcl
 module "alias_refresh" {
@@ -56,7 +56,7 @@ module "alias_refresh" {
 
 ### Lambda Alias (using existing alias)
 
-This is useful when extra configuration on existing Lambda alias is required.
+This is useful when extra configuration on the existing Lambda alias is required.
 
 ```hcl
 module "alias_refresh" {
@@ -86,7 +86,7 @@ module "alias_existing" {
 
 ## Conditional creation
 
-Sometimes you need to have a way to create resources conditionally but Terraform does not allow usage of `count` inside `module` block, so the solution is to specify `create` arguments.
+Sometimes you need to have a way to create resources conditionally, but Terraform does not allow the usage of `count` inside `module` block, so the solution is to specify `create` arguments.
 
 ```hcl
 module "lambda" {
@@ -155,7 +155,7 @@ No modules.
 | <a name="input_destination_on_failure"></a> [destination\_on\_failure](#input\_destination\_on\_failure) | Amazon Resource Name (ARN) of the destination resource for failed asynchronous invocations | `string` | `null` | no |
 | <a name="input_destination_on_success"></a> [destination\_on\_success](#input\_destination\_on\_success) | Amazon Resource Name (ARN) of the destination resource for successful asynchronous invocations | `string` | `null` | no |
 | <a name="input_event_source_mapping"></a> [event\_source\_mapping](#input\_event\_source\_mapping) | Map of event source mapping | `any` | `{}` | no |
-| <a name="input_function_name"></a> [function\_name](#input\_function\_name) | The function ARN of the Lambda function for which you want to create an alias. | `string` | `""` | no |
+| <a name="input_function_name"></a> [function\_name](#input\_function\_name) | Name or ARN of the Lambda function for which you want to create an alias. | `string` | n/a | yes |
 | <a name="input_function_version"></a> [function\_version](#input\_function\_version) | Lambda function version for which you are creating the alias. Pattern: ($LATEST\|[0-9]+). | `string` | `""` | no |
 | <a name="input_maximum_event_age_in_seconds"></a> [maximum\_event\_age\_in\_seconds](#input\_maximum\_event\_age\_in\_seconds) | Maximum age of a request that Lambda sends to a function for processing in seconds. Valid values between 60 and 21600. | `number` | `null` | no |
 | <a name="input_maximum_retry_attempts"></a> [maximum\_retry\_attempts](#input\_maximum\_retry\_attempts) | Maximum number of times to retry when the function returns an error. Valid values between 0 and 2. Defaults to 2. | `number` | `null` | no |
diff --git a/modules/alias/variables.tf b/modules/alias/variables.tf
index 732067f6..e666a91c 100644
--- a/modules/alias/variables.tf
+++ b/modules/alias/variables.tf
@@ -63,9 +63,8 @@ variable "description" {
 }
 
 variable "function_name" {
-  description = "The function ARN of the Lambda function for which you want to create an alias."
+  description = "Name or ARN of the Lambda function for which you want to create an alias."
   type        = string
-  default     = ""
 }
 
 variable "function_version" {
diff --git a/wrappers/alias/main.tf b/wrappers/alias/main.tf
index 7729dd06..f0805708 100644
--- a/wrappers/alias/main.tf
+++ b/wrappers/alias/main.tf
@@ -14,7 +14,7 @@ module "wrapper" {
   destination_on_failure                    = try(each.value.destination_on_failure, var.defaults.destination_on_failure, null)
   destination_on_success                    = try(each.value.destination_on_success, var.defaults.destination_on_success, null)
   event_source_mapping                      = try(each.value.event_source_mapping, var.defaults.event_source_mapping, {})
-  function_name                             = try(each.value.function_name, var.defaults.function_name, "")
+  function_name                             = try(each.value.function_name, var.defaults.function_name)
   function_version                          = try(each.value.function_version, var.defaults.function_version, "")
   maximum_event_age_in_seconds              = try(each.value.maximum_event_age_in_seconds, var.defaults.maximum_event_age_in_seconds, null)
   maximum_retry_attempts                    = try(each.value.maximum_retry_attempts, var.defaults.maximum_retry_attempts, null)