diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f316bb3..b50237b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -17,6 +17,7 @@ All functions in the standard library should follow the following outline:
 ; Result: <what is the result, and where is it stored>
 ; Clobbers: <list of registers that are clobbered>
 ; Globals: <list of globals are accessed. OPTIONAL>
+; Errors: <list of any status codes returned in flags. OPTIONAL>
 <label>: <;SHOULD BE INLINED>
     <CODE>