---
title: "Error of the Day"
url: https://erroneo.us/daily/
description: "One common error a day, explained and sourced: confused words, myths, cognitive biases, developer errors and money mistakes. New at midnight Pacific."
type: series-index
section: "Error of the Day"
date_modified: 2026-10-21
publisher: erroneo.us
license: All rights reserved. Quote with attribution and a link.
---

# Error of the Day

> Every day at midnight Pacific, one error people make all the time: what they get wrong, why it happens, the fix, and a memory trick that sticks. Every claim is linked to its source.

Today · October 21, 2026 · Language

## [Comprised of: the phrase editors keep circling](https://erroneo.us/daily/comprised-of/)

Dictionaries now record it, a third of one expert panel still objects, and there is a one-word fix that keeps everyone happy.

[Read the full entry →](https://erroneo.us/daily/comprised-of/)

The series rotates through five desks so no two days in a row cover the same ground: [Language](https://erroneo.us/language/) (confused words and grammar myths), [Developers](https://erroneo.us/developers/) (HTTP status codes and the bugs behind them), [Thinking](https://erroneo.us/thinking/) (cognitive biases and fallacies), [Myths](https://erroneo.us/myths/) (science, history and health misconceptions) and [Money](https://erroneo.us/myths/money-mistakes/) (personal-finance mistakes and scams). Seasonal entries land on their day: Halloween candy myths on October 31, daylight saving time on the day the clocks change, Thanksgiving turkey in Thanksgiving week.

Each entry is written to the same [editorial standards](https://erroneo.us/about/#editorial-standards) as our guides: at least two independent, reputable sources, every link checked before publication, and corrections made in public. Follow along by [RSS](https://erroneo.us/feed.xml), or ask your AI assistant to read [the JSON feed](https://erroneo.us/api/daily.json).

Language · 1

## October 2026

1. Oct 21 Language[TodayComprised of: the phrase editors keep circling](https://erroneo.us/daily/comprised-of/) 'Is comprised of' is common but many editors still flag it. The whole comprises the parts; the parts compose the whole. Use 'comprises' or 'consists of'.

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Source page: https://erroneo.us/daily/ · More: https://erroneo.us/llms.txt