diff --git a/website/docs/plugins/provider.html.md b/website/docs/plugins/provider.html.md
index 9b2a153aa..fd72c7214 100644
--- a/website/docs/plugins/provider.html.md
+++ b/website/docs/plugins/provider.html.md
@@ -211,6 +211,8 @@ The CRUD operations in more detail, along with their contracts:
       Terraform guarantees that an existing ID will be set. This ID should be
       used to look up the resource. Any remote data should be updated into
       the local data. **No changes to the remote resource are to be made.**
+      If the resource is no longer present, calling `SetId`
+      with an empty string will signal its removal.
 
   * `Update` - This is called to update properties of an existing resource.
       Terraform guarantees that an existing ID will be set. Additionally,
@@ -223,8 +225,10 @@ The CRUD operations in more detail, along with their contracts:
 
   * `Exists` - This is called to verify a resource still exists. It is
       called prior to `Read`, and lowers the burden of `Read` to be able
-      to assume the resource exists. If the resource is no longer present in
-      remote state,  calling `SetId` with an empty string will signal its removal.
+      to assume the resource exists. `false` should be returned if
+      the resources is no longer present, which has the same effect
+      as calling `SetId("")` from `Read` (i.e. removal of the resource data
+      from state).
 
 ## Schemas