diff --git a/data/patch.json b/data/patch.json
index 798e3741..57e2d34a 100644
--- a/data/patch.json
+++ b/data/patch.json
@@ -581,6 +581,9 @@
         "attr-fallback": {
             "syntax": "<any-value>"
         },
+        "attr-unit": {
+            "syntax": "'%' | cm | mm | q | in | pt | pc | px | em | rem | ex | rex | cap | rcap | ch | rch | ic | ric | lh | rlh | vw | svw | lvw | dvw | vh | svh | lvh | dvh | vi | svi | lvi | dvi | vb | svb | lvb | dvb | vmin | svmin | lvmin | dvmin | vmax | svmax | lvmax | dvmax | cqw | cqh | cqi | cqb | cqmin | cqmax | deg | grad | rad | turn | s | ms | hz | khz | dpi | dpcm | dppx | x | fr | db | st"
+        },
         "autospace": {
             "syntax": "no-autospace | [ ideograph-alpha || ideograph-numeric || punctuation ] || [ insert | replace ]"
         },