diff --git a/README.md b/README.md
index 3f6cc5c..bb82030 100644
--- a/README.md
+++ b/README.md
@@ -196,7 +196,7 @@ Conditionally include portions of the document.
 
 Expects to receive an array where the first element is a condition, the second is
 the value if the condition is true, and the third is the value if the condition
-is false.
+is false (this one is optional).
 
 Expressions use postfix notation because this is a play project right now and
 it's both fun and easy to implement and my HP calculator demanded it. Bright side,