diff --git a/Checklist-Proton-bugs.md b/Checklist-Proton-bugs.md
index 158320d..d53be63 100644
--- a/Checklist-Proton-bugs.md
+++ b/Checklist-Proton-bugs.md
@@ -75,4 +75,9 @@ These include:
 - .NET-WPF (PresentationFramework)
 - .NET-XNA (Uses XNA framework, implies Xaudio2 and possibly WMP)
 
+### wine-mono
+
+If you're seeing this bug, try Proton 4.2-3 or newer. (wine-mono is included starting with Proton 4.2-3)
+- ```err:mscoree:CLRRuntimeInfo_GetRuntimeHost Wine Mono is not installed```
+
 ---