diff --git a/src/vs/languages/css/common/buildscripts/css-schema.xml b/src/vs/languages/css/common/buildscripts/css-schema.xml
index a48e35bfd36ac98e55394c7634b1bb545a11e3e1..a35bb124fa4bc4de4a64aab5dbd1e692e16e5f96 100644
--- a/src/vs/languages/css/common/buildscripts/css-schema.xml
+++ b/src/vs/languages/css/common/buildscripts/css-schema.xml
@@ -6251,6 +6251,27 @@
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+ Defines the formula that must be used to mix the colors with the backdrop.
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Property causes the element or pseudo-element to be removed from the flow and reinserted at a later point in the document.