From e63dc9578038c2b0d7f02b1276096a8f105f4f03 Mon Sep 17 00:00:00 2001
From: MANISH WALIA <78153901+manishwalia15@users.noreply.github.com>
Date: Sun, 13 Oct 2024 01:46:33 +0530
Subject: [PATCH] Update INSTALL.md

---
 INSTALL.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/INSTALL.md b/INSTALL.md
index 74fcc58348b43..1d154b90586d4 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -281,3 +281,12 @@ compile for a platform without host tools you must cross-compile.
 
 You may find that other platforms work, but these are our officially supported
 build environments that are most likely to work.
+
+## External LLVM Version Compatibility
+
+To build `rustc`, it is important to know which versions of LLVM are supported. As of Rust 1.82, the following external LLVM versions are supported:
+
+- **Minimum Supported Version**: LLVM 18
+- **Maximum Supported Version**: LLVM 19
+
+If you attempt to use LLVM versions outside this range, you may encounter compatibility issues when compiling `rustc`. Please ensure you are using a compatible version for your build.