diff --git a/atomics/Indexes/index.yaml b/atomics/Indexes/index.yaml
index 8b99c367..ecf12813 100644
--- a/atomics/Indexes/index.yaml
+++ b/atomics/Indexes/index.yaml
@@ -9349,7 +9349,8 @@ privilege-escalation:
         computer starts up various applications and may in fact drive you crazy. A
         reliable way to make the message box appear and verify the \nAppInit Dlls
         are loading is to start the notepad application. Be sure to run the cleanup
-        commands afterwards so you don't keep getting message boxes showing up\n"
+        commands afterwards so you don't keep getting message boxes showing up.\n\nNote:
+        If secure boot is enabled, this technique will not work. https://docs.microsoft.com/en-us/windows/win32/dlls/secure-boot-and-appinit-dlls\n"
       supported_platforms:
       - windows
       input_arguments:
@@ -37163,7 +37164,8 @@ persistence:
         computer starts up various applications and may in fact drive you crazy. A
         reliable way to make the message box appear and verify the \nAppInit Dlls
         are loading is to start the notepad application. Be sure to run the cleanup
-        commands afterwards so you don't keep getting message boxes showing up\n"
+        commands afterwards so you don't keep getting message boxes showing up.\n\nNote:
+        If secure boot is enabled, this technique will not work. https://docs.microsoft.com/en-us/windows/win32/dlls/secure-boot-and-appinit-dlls\n"
       supported_platforms:
       - windows
       input_arguments:
diff --git a/atomics/T1546.010/T1546.010.md b/atomics/T1546.010/T1546.010.md
index d0d2cd8b..6a34b973 100644
--- a/atomics/T1546.010/T1546.010.md
+++ b/atomics/T1546.010/T1546.010.md
@@ -17,7 +17,9 @@ The AppInit DLL functionality is disabled in Windows 8 and later versions when s
 AppInit_DLLs is a mechanism that allows an arbitrary list of DLLs to be loaded into each user mode process on the system. Upon succesfully execution, 
 you will see the message "The operation completed successfully." Each time the DLL is loaded, you will see a message box with a message of "Install AppInit Shim DLL was called!" appear.
 This will happen regularly as your computer starts up various applications and may in fact drive you crazy. A reliable way to make the message box appear and verify the 
-AppInit Dlls are loading is to start the notepad application. Be sure to run the cleanup commands afterwards so you don't keep getting message boxes showing up
+AppInit Dlls are loading is to start the notepad application. Be sure to run the cleanup commands afterwards so you don't keep getting message boxes showing up.
+
+Note: If secure boot is enabled, this technique will not work. https://docs.microsoft.com/en-us/windows/win32/dlls/secure-boot-and-appinit-dlls
 
 **Supported Platforms:** Windows