diff --git a/README.md b/README.md
index b90bd9ee82..b1f23f3d16 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ SPIR-V          | :white_check_mark: | spv-out  |       |
 WGSL            | :ok:               | wgsl-out |       |
 Metal           | :white_check_mark: | msl-out  |       |
 HLSL            | :ok:               | hlsl-out | Shader Model 5.0+ (DirectX 11+) |
-GLSL            | :ok:               | glsl-out |       |
+GLSL            | :ok:               | glsl-out | GLSL 330+ and GLSL ES 300+ |
 AIR             |                    |          |       |
 DXIL/DXIR       |                    |          |       |
 DXBC            |                    |          |       |