diff --git a/SC2016.md b/SC2016.md
index 500967d..899d018 100644
--- a/SC2016.md
+++ b/SC2016.md
@@ -36,6 +36,11 @@ If you know that you want the expression literally without expansion, you can [[
 echo 'PATH=$PATH:/usr/local/bin' >> ~/.bashrc
 ```
 
+```
+# We also want this variable to output $BASH_SOURCE:$LIN... during an execution trace. 
+PS4='+$BASH_SOURCE:$LINENO:$FUNCNAME: '
+```
+
 ShellCheck also does not warn about escaped expansions in double quotes:
 
 ```