diff --git a/extensions/2.0/Khronos/KHR_materials_ior/README.md b/extensions/2.0/Khronos/KHR_materials_ior/README.md
index 2c8e9d0d70..a28011f14c 100644
--- a/extensions/2.0/Khronos/KHR_materials_ior/README.md
+++ b/extensions/2.0/Khronos/KHR_materials_ior/README.md
@@ -47,7 +47,7 @@ Written against the glTF 2.0 spec.
 
 ## Overview
 
-The dielectric BRDF of the metallic-roughness material in glTF uses a fixed value of 1.5 for the index of refraction. This is a good fit for many plastics and glass, but not for other materials like water or asphalt, sapphire or diamond. This extensions allows users to set the index of refraction to a certain value.
+The dielectric BRDF of the metallic-roughness material in glTF uses a fixed value of 1.5 for the index of refraction. This is a good fit for many plastics and glass, but not for other materials like water or asphalt, sapphire or diamond. This extension allows users to set the index of refraction to a certain value.
 
 ## Extending Materials