diff --git a/McRule/McRule.csproj b/McRule/McRule.csproj
index 10824cf..342d305 100644
--- a/McRule/McRule.csproj
+++ b/McRule/McRule.csproj
@@ -8,7 +8,7 @@
     <UserSecretsId>63a98c68-03bd-4069-b6b9-e0978081c430</UserSecretsId>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
     <Title>McRule - Rule based expression generator</Title>
-		<Version>0.3.1</Version>
+		<Version>4.0.0</Version>
 		<Company>Sean McArdle</Company>
 		<Description>Library for generating expression trees from simple policy rules.</Description>
 		<Copyright>2023 Sean McArdle</Copyright>
diff --git a/README.md b/README.md
index 5d37c9f..8a47531 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ A simple equality comparison is used by default but operators can be prefixed to
 | IComparable   | <>, !=, ! | Not-equal to comparison.                                                                                                                                                                                                                                                                                                                      |
 
 > Note: the IComparable interface is mostly used for numerical types but custom types with comparison providers may work at runtime.
+> Note: initial IDictionary support has been added but only for collections where the value types are strings. When missing keys are encountered, evaluation defaults to false.
 
 ### Literal Values
 Literal values, as needed, use handlbar syntax: {{ value }}. Null checks are implicitly added to most expressions but sometimes you need an expression that evaluates true for null values. In that case, a null literal is represented as {{null}}.