diff --git a/examples/simple/variables.tf b/examples/simple/variables.tf
index 1f09513..c178434 100644
--- a/examples/simple/variables.tf
+++ b/examples/simple/variables.tf
@@ -12,7 +12,6 @@ variable "vpc_id" {
   }
 }
 
-
 variable "subnets" {
   description = "Specify the subnets used by this cluster"
   type        = list(string)
diff --git a/variables.tf b/variables.tf
index bbc10c6..fbc352b 100644
--- a/variables.tf
+++ b/variables.tf
@@ -70,10 +70,10 @@ variable "tags" {
       (
         # Allow either production format or test format
         can(regex("^[\\w\\s+=.@-]*$", k)) && can(regex("^[\\w\\s+=.@-]*$", v)) ||
-        can(regex("^Environment$", k)) && can(regex("^test$", v)) # Special case for test environment
+        can(regex("^environment$", k)) && can(regex("^test$", v)) # Special case for test environment
       )
     ])
-    error_message = "Tag keys must be <= 128 chars, values <= 256 chars, and both can only contain alphanumeric characters, spaces, and '.+-=@_'. For test environment, use 'Environment': 'test'."
+    error_message = "Tag keys must be <= 128 chars, values <= 256 chars, and both can only contain alphanumeric characters, spaces, and '.+-=@_'. For test environment, use 'environment': 'test'."
   }
 }