diff --git a/components/style/gecko/selector_parser.rs b/components/style/gecko/selector_parser.rs
index 75e53a01db4..827e832ebcd 100644
--- a/components/style/gecko/selector_parser.rs
+++ b/components/style/gecko/selector_parser.rs
@@ -96,7 +96,6 @@ impl ToCss for NonTSPseudoClass {
                     }, )*
                     NonTSPseudoClass::Dir(ref dir) => {
                         dest.write_str(":dir(")?;
-                        // FIXME: This should be escaped as an identifier; see #19231
                         (**dir).to_css(dest)?;
                         return dest.write_char(')')
                     },
diff --git a/components/style/selector_parser.rs b/components/style/selector_parser.rs
index ac44cc0135a..b4870557cc2 100644
--- a/components/style/selector_parser.rs
+++ b/components/style/selector_parser.rs
@@ -191,6 +191,7 @@ impl ToCss for Direction {
         let dir_str = match *self {
             Direction::Rtl => "rtl",
             Direction::Ltr => "ltr",
+            // FIXME: This should be escaped as an identifier; see #19231
             Direction::Other(ref other) => other,
         };
         dest.write_str(dir_str)