layers: Clarify std_validation usage in README

Change-Id: Ia99542ca3f96d719f60d5dccab115340bd88c3f3

diff --git a/layers/vk_validation_layer_details.md b/layers/vk_validation_layer_details.md
index 3e9029f..62a2fa5 100644 (file)
--- a/layers/vk_validation_layer_details.md
+++ b/layers/vk_validation_layer_details.md
@@ -6,7 +6,7 @@
 
 ### VK_LAYER_LUNARG_standard_validation Overview
 
-This is a meta-layer managed by the loader. Specifying this layer name will cause the loader to load the all of the standard validation layers in the following optimal order:
+This is a meta-layer managed by the loader. On desktop systems, specifying this layer name will cause the loader to load the all of the standard validation layers in the following optimal order:
 
  - VK_LAYER_GOOGLE_threading
  - VK_LAYER_LUNARG_parameter_validation
@@ -16,6 +16,8 @@ This is a meta-layer managed by the loader. Specifying this layer name will caus
  - VK_LAYER_LUNARG_swapchain
  - VK_LAYER_GOOGLE_unique_objects
 
+For platforms not using the standard loader (i.e., mobile platforms) the layers should be declared explicitly in the order shown above.
+
 Other layers can be specified and the loader will remove duplicates. See the following individual layer descriptions for layer details.
 
 ## VK_LAYER_LUNARG_core_validation