diff --git a/src/filters/cosmetic.rs b/src/filters/cosmetic.rs
index 3e26b65..956a723 100644
--- a/src/filters/cosmetic.rs
+++ b/src/filters/cosmetic.rs
@@ -169,6 +169,8 @@ impl CosmeticFilter {
             || content_after_colon.starts_with("subject")
             || content_after_colon.starts_with("xpath")
             || content_after_colon.starts_with("nth-ancestor")
+            || content_after_colon.starts_with("upward")
+            || content_after_colon.starts_with("remove")
             {
                 return Err(CosmeticFilterError::UnsupportedSyntax);
             }