Knuth Issues $2.88 Reward Check for Error on Page 1 of Computer Modern Typefaces Volume E

Huehn identified a typographical error in the opening paragraph of Knuth's 1986 volume E in the Computers & Typesetting series. He verified the discrepancy over months before submission. Knuth confirmed the find and issued payment, as documented in the recipient's 2024 account. The memo field recorded the entry as E1, matching the volume and page identifier.

Knuth's error bounty system, active since the 1980s, pays $2.56 for verified mistakes in his publications, with adjustments for additional contributions. A later incorrect submission yielded $0.32 after Knuth counted one sentence as a useful suggestion. Primary records show physical checks ceased years ago, replaced by San Serriffe Bank certificates. Data from recipient reports indicate fewer than 100 documented payouts across all volumes despite millions of readers.

The system enforces rigorous pre-publication scrutiny in TeX and METAFONT implementations. It connects to Knuth's 1978-1986 typesetting work where small font definition errors propagate through Arabic numeral handling. Operational impact includes sustained low defect rates in core Computer Modern fonts used by academic publishing pipelines. No equivalent bounty mechanisms exist in modern font standards such as OpenType.

Future distributions will remain certificate-based. No threshold exists for resuming printed checks.