diff --git a/Known-issues.md b/Known-issues.md
index 3a2bc48..ff2c9d1 100644
--- a/Known-issues.md
+++ b/Known-issues.md
@@ -19,7 +19,7 @@
 
 ### SDVX
 
- * EG may launch at wrong refresh rate when using the auto-rotate option. Please enable `-9on12` and `-graphics-force-refresh` to work around this.
+ * EG may launch at wrong refresh rate when using the auto-rotate option. Please enable `-9on12` and `-graphics-force-refresh` to work around this. (Note that, depending on your GPU, 9on12 may result in poor performance - or maybe better performance, it depends)
 
 #### VM mode specific