diff --git a/Compiler-module-reference.md b/Compiler-module-reference.md
index 6004772..53228c3 100644
--- a/Compiler-module-reference.md
+++ b/Compiler-module-reference.md
@@ -175,7 +175,7 @@ used to find the header of a procedure. Used to determine if
 able to give a string representation in the AST. 
 
 ###rodread - 
-Reader of rod files, the symbol file mechanism 
+Reader of rod files, the symbol file mechanism. It also does module dependency tracking to decide whether a rod file can be used or whether the module needs to be recompiled
 
 ###rodutils - 
 utilities for above