diff --git a/Developer-Guides/Metal-Frame-Capture.md b/Developer-Guides/Metal-Frame-Capture.md
index 33f728f..067866c 100644
--- a/Developer-Guides/Metal-Frame-Capture.md
+++ b/Developer-Guides/Metal-Frame-Capture.md
@@ -21,4 +21,5 @@ Xcode seems to be more willing to harness an application properly if it's nomina
 * plist frame capture / metal api validation settings
 * debug mvk substitution
 * settings (software mem, hv, etc)
+* SIGUSR1
   
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