Empty sources bug fixed: hardcoded test data replaced with live dataset via prebuild script
AdSense sidebar placeholder added to AI Q&A page for future monetization
"New Chat" button visibility improved (solid green background)
2026-05-19v1.8
Partnership Letters Full-Text Data Entry (1965)
1965 mid-year letter (Jul 9, 1965): fullText from 1965-1.docx — "First Half Performance", 10.4% vs 0.8% Dow (9.6pt advantage), Berkshire controlling interest acquisition discussed
1965 special letter (Nov 1, 1965): fullText from 1965-2.docx — commitment letter for 1966, Ground Rule 7 introduced, Berkshire Hathaway valuation methodology explained
1965 partnership letter (Jan 20, 1966): fullText from 1965-3.docx — "Our Performance in 1965", partnership gained 47.2% vs 14.2% Dow, widest margin in BPL history
2026-05-19v1.7
Partnership Letters Full-Text Data Entry (1963-1964)
1963 mid-year letter (Jul 10, 1963): fullText from 1963-1.docx — Dempster Mill turnaround, 14% vs 10% Dow
1963 partnership letter (Jan 18, 1964): fullText from 1963-3.docx — "Our Performance in 1963", 38.7% vs 20.7% Dow
1963 special letter (Nov 6, 1963): fullText from 1963-2.docx — annual administrative letter to partners for 1964
1964 mid-year letter (Jul 8, 1964): fullText from 1964-1.docx — plus 8.1% vs Dow plus 3.8% in first half
1964 partnership letter (Jan 18, 1965): fullText from 1964-2.docx — "Our Performance in 1964", 27.8% vs 18.7% Dow
2026-05-19v1.6
Partnership Letters Full-Text Data Entry (1960-1962)
1960 partnership letter (Jan 30, 1961): fullText populated from 1960.docx
1961 mid-year letter (Jul 22, 1961): fullText populated from 1961.docx
1961 partnership letter (Jan 24, 1962): fullText populated from 1961.docx
1962 mid-year letter (Jul 6, 1962): fullText populated from 1962.docx
1962 partnership letter corrected (Jan 18, 1963): replaced incorrect content from 1962-2.docx with correct text from 1962-3.docx
Automated .docx parsing pipeline: HTML table extraction, format preservation, letters.ts injection
2026-05-18v1.5
UI Polish & Cross-Reference Enhancement
TopBar navigation: upgraded to white background with border and scroll shadow for clearer visual separation
New "Links to This Page" sidebar module on every letter page — shows all concepts that reference the current letter
AdSense ad placements on letter detail pages: inline ad below title, sidebar ad at bottom
Full-site container width unified to max-w-7xl (1280px) across all 14 page types
Footer width fixed: max-w-content replaced with max-w-7xl, matching body container
About page: removed inner max-w-3xl constraint, full content width now used; text set to justify alignment
Blog link removed from sidebar navigation
2026-05-18v1.4
Branding & Navigation Refinement
Sidebar branding upgrade: "Buffett" in theme color, slogan "Built for value investors."
Favicon redesigned with lightbulb icon matching brand identity
Sidebar nav restructured: Home link added, Archive section renamed to Browse
AI Q&A moved from sidebar to top navigation bar (between Knowledge Graph and PDF Download)
New Changelog page added under About section
ShareToolbar added to every letter page with social sharing, copy link, print-to-PDF, and official source link
LetterInterpretation component: categorized Explore Further (Concepts / Companies / People)
2026-05-17v1.3
AI Q&A (RAG) + SEO Enhancements
AI Q&A feature launched with RAG architecture (retrieval-augmented generation)
Cloudflare Worker backend for OpenAI GPT-4o-mini integration