diff --git a/libraries/bxdf/standard_surface.mtlx b/libraries/bxdf/standard_surface.mtlx
index 20ef806699..495958448d 100644
--- a/libraries/bxdf/standard_surface.mtlx
+++ b/libraries/bxdf/standard_surface.mtlx
@@ -82,7 +82,7 @@
+ doc="The thickness of the thin film layer on a surface. Use for materials such as multitone car paint or soap bubbles (in nanometers)." />
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