diff --git a/README.md b/README.md
index 26ccd2f..aea2b9f 100644
--- a/README.md
+++ b/README.md
@@ -193,6 +193,11 @@ TERRATAG_DEFAULT_TO_TERRAFORM
 ## Notes
 
 - Resources already having the exact same tag as the one being appended will be overridden
+- Supported providers
+  - `aws`
+  - `google`
+  - `azurerm`
+  - `azurestack`
 
 ## Develop