diff --git a/README.md b/README.md
index d9f5987..4a26e89 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ The following return types are currently available:
 * usize
 * f64
 
-Boolean values can only be `None` or `Some`.  
+Boolean values can only be `None` or `Some(true)`.  
 The other values can be `None` or `Some(_)`
 
 # Todo