diff --git a/specification/2.0/Specification.adoc b/specification/2.0/Specification.adoc
index d7803170c5..614a28afee 100644
--- a/specification/2.0/Specification.adoc
+++ b/specification/2.0/Specification.adoc
@@ -2027,7 +2027,7 @@ The `alphaMode` property defines how the alpha value is interpreted. The alpha v
 `alphaMode` can be one of the following values:
 
 * `OPAQUE` - The rendered output is fully opaque and any alpha value is ignored.
-* `MASK` - The rendered output is either fully opaque or fully transparent depending on the alpha value and the specified _alpha cutoff_ value.
+* `MASK` - The rendered output is either fully opaque or fully transparent depending on the alpha value and the specified _alpha cutoff_ value; the exact appearance of the edges **MAY** be subject to implementation-specific techniques such as "`Alpha-to-Coverage`".
 +
 [NOTE]
 .Note
diff --git a/specification/2.0/schema/material.schema.json b/specification/2.0/schema/material.schema.json
index e1e253338b..ebfb8406b5 100644
--- a/specification/2.0/schema/material.schema.json
+++ b/specification/2.0/schema/material.schema.json
@@ -52,7 +52,7 @@
                 },
                 {
                     "const": "MASK",
-                    "description": "The rendered output is either fully opaque or fully transparent depending on the alpha value and the specified `alphaCutoff` value."
+                    "description": "The rendered output is either fully opaque or fully transparent depending on the alpha value and the specified `alphaCutoff` value; the exact appearance of the edges **MAY** be subject to implementation-specific techniques such as \"`Alpha-to-Coverage`\"."
                 },
                 {
                     "const": "BLEND",