diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a1a9ec8b8..f34b42fe2a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+### 0.20.1
+###### Fixes
+- Update rule [E8003](https://github.com/aws-cloudformation/cfn-python-lint/blob/master/docs/rules.md#E8003) to support more functions inside a Fn::Equals
+
 ### 0.20.0
 ###### Features
 - Allow a rule's exception to be defined in a [resource's metadata](https://github.com/kddejong/cfn-python-lint/tree/Release/v0.20.0#resource-based-metadata)
diff --git a/README.md b/README.md
index 74afa0112d..759a918733 100644
--- a/README.md
+++ b/README.md
@@ -208,7 +208,7 @@ If you'd like cfn-lint to be run automatically when making changes to files in y
 ```yaml
 repos:
 -   repo: https://github.com/aws-cloudformation/cfn-python-lint
-    rev: v0.20.0  # The version of cfn-lint to use
+    rev: v0.20.1  # The version of cfn-lint to use
     hooks:
     -   id: cfn-python-lint
         files: path/to/cfn/dir/.*\.(json|yml|yaml)$
diff --git a/src/cfnlint/rules/conditions/Equals.py b/src/cfnlint/rules/conditions/Equals.py
index 358026c57b..4407c62f02 100644
--- a/src/cfnlint/rules/conditions/Equals.py
+++ b/src/cfnlint/rules/conditions/Equals.py
@@ -57,22 +57,22 @@ def match(self, cfn):
                         if len(element) == 1:
                             for element_key in element.keys():
                                 if element_key not in allowed_functions:
-                                    message = 'Fn::Equals element must be a string, Ref, or a Fn::FindInMap'
+                                    message = 'Fn::Equals element must be a supported function ({0})'
                                     matches.append(RuleMatch(
                                         equal_tree[:-1] + [index, element_key],
-                                        message.format()
+                                        message.format(', '.join(allowed_functions))
                                     ))
                         else:
-                            message = 'Fn::Equals element must be a string, Ref, or a Fn::FindInMap'
+                            message = 'Fn::Equals element must be a supported function ({0})'
                             matches.append(RuleMatch(
                                 equal_tree[:-1] + [index],
-                                message.format()
+                                message.format(', '.join(allowed_functions))
                             ))
                     elif not isinstance(element, (six.string_types, bool, six.integer_types, float)):
-                        message = 'Fn::Equals element must be a string, Ref, or a Fn::FindInMap'
+                        message = 'Fn::Equals element must be a String, Boolean, Number, or supported function ({0})'
                         matches.append(RuleMatch(
                             equal_tree[:-1] + [index],
-                            message.format()
+                            message.format(', '.join(allowed_functions))
                         ))
 
         return matches
diff --git a/src/cfnlint/version.py b/src/cfnlint/version.py
index 09a48ec781..03fb60064e 100644
--- a/src/cfnlint/version.py
+++ b/src/cfnlint/version.py
@@ -15,4 +15,4 @@
   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 """
 
-__version__ = '0.20.0'
+__version__ = '0.20.1'