diff --git a/book/installation/source.md b/book/installation/source.md
index a076e0003..a4448482d 100644
--- a/book/installation/source.md
+++ b/book/installation/source.md
@@ -1,6 +1,10 @@
 # Build from Source
 
-You can build Reth on Linux, macOS, and Windows WSL. 
+You can build Reth on Linux, macOS, and Windows WSL2.
+
+> **Note**
+>
+> Reth does **not** work on Windows WSL1.
 
 ## Dependencies
 
@@ -127,4 +131,4 @@ binary](../installation/binaries.md).
 
 If compilation fails with `error: linking with cc failed: exit code: 1`, try running `cargo clean`.
 
-_(Thanks to Sigma Prime for this section from [their Lighthouse book](https://lighthouse-book.sigmaprime.io/installation.html)!)_
\ No newline at end of file
+_(Thanks to Sigma Prime for this section from [their Lighthouse book](https://lighthouse-book.sigmaprime.io/installation.html)!)_