diff --git a/lua/pac3/libraries/shader_params.lua b/lua/pac3/libraries/shader_params.lua
index 685a94df2..36d094ae4 100644
--- a/lua/pac3/libraries/shader_params.lua
+++ b/lua/pac3/libraries/shader_params.lua
@@ -624,6 +624,12 @@ return {
 					default = false,
 					description = "flag",
 				},
+				allowdiffusemodulation = {
+					type = "bool",
+					default = true,
+					friendly = "AllowDiffuseModulation",
+					description = "Prevents the material from being tinted.",
+				}
 			},
 			["bump map"] = {
 				bumpmap = {