diff --git a/CODING_STYLE.md b/CODING_STYLE.md
index ff1a29edf7a7..1f540e0c9356 100644
--- a/CODING_STYLE.md
+++ b/CODING_STYLE.md
@@ -62,6 +62,11 @@ line width, indentation and ordering (for includes, using directives and etc). 
   their public APIs. Only use test methods in rare edge cases where this is not
   possible. For example, MemoryAllocator::testingSetFailureInjection() is used
   to to inject various memory allocation failures to test error handling paths.
+* Use the **debug** prefix for query configs that are intended for debugging
+  purposes only. These configs may enable expensive checks or disable selective
+  code paths, and are not recommended for use in production environments. For
+  example, `debug_disable_expression_with_peeling` is used to disable peeling
+  optimization employed in expression evaluation.
 
 ## Comments