From fa9285a663806ecacf7407ddb7fe25528b1e297b Mon Sep 17 00:00:00 2001
From: Steve Yegge <steve.yegge@gmail.com>
Date: Sat, 29 Nov 2025 23:13:34 -0800
Subject: [PATCH] docs: fix birthday paradox threshold explanation in README
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Fixed incorrect reference to "1% collision point at ~1,217" when 1,217
is actually the 50% collision point for 5-char hashes. The 1% point
is ~153.

Fixes #407

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index e421f581..04d096b7 100644
--- a/README.md
+++ b/README.md
@@ -375,7 +375,7 @@ Hash IDs use **birthday paradox probability** to determine length:
 | 5 chars     | 1,048,576   | ~1,217 issues             | ~153 issues              |
 | 6 chars     | 16,777,216  | ~4,869 issues             | ~612 issues              |
 
-**Our thresholds are conservative:** We switch from 4→5 chars at 500 issues (way before the 1% collision point at ~1,217) and from 5→6 chars at 1,500 issues.
+**Our thresholds are conservative:** We switch from 4→5 chars at 500 issues (well past the 4-char 1% threshold of ~38, giving headroom before 50% at ~304) and from 5→6 chars at 1,500 issues (same pattern for 5-char thresholds).
 
 **Progressive extension on collision:** If a hash collision does occur, bd automatically extends the hash to 7 or 8 characters instead of remapping to a new ID.