diff --git a/resources/css/components/field.css b/resources/css/components/field.css
index fce268eb..ba761590 100644
--- a/resources/css/components/field.css
+++ b/resources/css/components/field.css
@@ -16,6 +16,8 @@
  *   .field               the whole thing; `class` from the call site lands here; data-variant, data-size
  *     .field-box         the 56px row: icon, prefix, control, suffix, trailing
  *       .field-control   the <input>, <select> or <textarea>
+ *       .field-trailing  what ends the row; .field-error is the error icon M3 asks for as the
+ *                        error state's second indicator
  *       .field-outline   the fieldset and its legend (the filled field's indicator line)
  *       .field-label     the visible label
  *     .field-support     the hint, or the error in its place