From 815ddc53d4b4653e17219c374d0613b5af7b81f9 Mon Sep 17 00:00:00 2001
From: x86byte <111459558+x86byte@users.noreply.github.com>
Date: Mon, 29 Jun 2026 12:55:18 +0100
Subject: [PATCH] readme: document --subs-only flag

---
 README.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index eff6c29..4728aba 100644
--- a/README.md
+++ b/README.md
@@ -26,10 +26,11 @@ It handles indirect branches by:
 ## usage
 
 ```
-cfgrip <binary>
+cfgrip [--subs-only] <binary>
 ```
 
-That's it. Feed it a binary, get `<binary>.cfg` as output.
+Feed it a binary, get `<binary>.cfg` as output.  
+Use `--subs-only` to extract only functions reachable from the entry point through the call graph — skips unreachable exports and prolog candidates.
 
 ---
 Example:
@@ -415,5 +416,6 @@ cmake --build build --config Release
 | | Exports | YES |
 | | `call` targets | YES |
 | | Prolog scanning (`push rbp`, CET `endbr64`) | YES |
+| **Subs-only mode** | `--subs-only` flag | YES |