diff --git a/ToolboxStack/QWEN.md b/ToolboxStack/QWEN.md
index 590919c..c6442f1 100644
--- a/ToolboxStack/QWEN.md
+++ b/ToolboxStack/QWEN.md
@@ -189,6 +189,9 @@ I am ready to proceed with any directed tasks. Please provide specific instructi
 - The NewToolbox.sh script has been removed
 - Various PROMPT files have been updated across toolboxes
 
+## Source of Truth Principle
+**CRITICAL**: The filesystem is ALWAYS the source of truth. Git should reflect the state of the filesystem. Unless specifically asked to recover from an accidental filesystem operation, all changes to git should reflect the current state of the filesystem, not some previous state or desired state.
+
 ## Audit and Assessment Responsibilities
 
 As part of my role in maintaining the ToolboxStack, I may conduct ongoing audits of the directory tree with the following focus areas: