diff --git a/Makefile b/Makefile
index 3bac916..90964a8 100644
--- a/Makefile
+++ b/Makefile
@@ -17,8 +17,7 @@ vnu.jar: vnu.jar_$(VNU_RELEASE).zip
 .PHONY:
 validate: vnu.jar
 	hyde gen
-	java -jar vnu.jar --stdout $$(find deploy -name '*.html') | egrep -v 'Section lacks heading|Article lacks heading|Consider using the “h1” element as a top-level heading only' || true
-	java -jar vnu.jar --css --stdout $$(find deploy -name '*.css')
+	java -jar vnu.jar --also-check-css --stdout $$(find deploy -name '*.html' -o -name '*.css') | egrep -v 'Section lacks heading|Article lacks heading|Consider using the “h1” element as a top-level heading only' || true
 	java -jar vnu.jar --svg --stdout $$(find deploy -name '*.svg') | egrep -v 'The value of attribute “unicode” on element “glyph” from namespace “http://www.w3.org/2000/svg” is not in Unicode Normalization Form C.' || true
 
 .PHONY: update-tufte-css