diff --git a/README.md b/README.md
index 8a0690f9..6b774a94 100644
--- a/README.md
+++ b/README.md
@@ -187,9 +187,12 @@ export OPENAI_MODEL=gpt-4o
 | `CODEX_API_KEY` | Codex only | Codex/ChatGPT access token override |
 | `CODEX_AUTH_JSON_PATH` | Codex only | Path to a Codex CLI `auth.json` file |
 | `CODEX_HOME` | Codex only | Alternative Codex home directory (`auth.json` will be read from here) |
+| `OPENCLAUDE_DISABLE_CO_AUTHORED_BY` | No | Set to `1` to suppress the default `Co-Authored-By` trailer in generated git commit messages |
 
 You can also use `ANTHROPIC_MODEL` to override the model name. `OPENAI_MODEL` takes priority.
 
+OpenClaude PR bodies use OpenClaude branding by default. `OPENCLAUDE_DISABLE_CO_AUTHORED_BY` only affects the commit trailer, not PR attribution text.
+
 ---
 
 ## Runtime Hardening