Update output.mdx

content/terraform/v1.13.x/docs/cli/commands/output.mdx

@@ -35,6 +35,43 @@ refer to [Manage sensitive data](/terraform/language/manage-sensitive-data).
 
 ## Examples
 
+Get output of a module:
+(c) https://stackoverflow.com/questions/52503528/why-is-my-terraform-output-not-working-in-module#After%20Terraform%200.12
+
+- Before Terraform 0.12
+
+    The below command shows the output for a specific module
+
+    `terraform output -module=example_module`
+
+- After Terraform 0.12
+
+    The below command fails in Terraform 0.12 and above with an error:
+
+    ```hcl
+    terraform output -module=example_module
+
+    Error: Unsupported option
+
+    The -module option is no longer supported since Terraform 0.12, because now
+    only root outputs are persisted in the state.
+    ```
+
+    To get outputs from a module in Terraform 0.12 and above, you must export them from the root (e.g example_module) module using an output block in the caller module.
+
+    This can be now done simply by adding one line in the caller module like below:
+
+    ```hcl
+    output "example_module_outputs" {
+      value = module.example_module
+    }
+    ```
+    Now you can see the output running the following command:
+
+    `terraform output`
+
+
+
 These examples assume the following Terraform output snippet.
 
 ```hcl