diff --git a/glossary/Function.md b/glossary/Function.md
index 5a90c7f39..83af63490 100644
--- a/glossary/Function.md
+++ b/glossary/Function.md
@@ -1,5 +1,5 @@
 ### Function
 
 Functions are self-contained blocks of code with their own scope, that can be called by other code and are usually associated with a unique identifier.
-Functions accept input in the form of arguments and can optionally return an output. 
+Functions accept input in the form of arguments and can optionally return an output (if no `return` statement is present, the default value of `undefined` will be returned instead). 
 JavaScript functions are also objects.