diff --git a/ApiDoctor.Validation/ExtensionMethods.cs b/ApiDoctor.Validation/ExtensionMethods.cs
index 34cf270a..160f952b 100644
--- a/ApiDoctor.Validation/ExtensionMethods.cs
+++ b/ApiDoctor.Validation/ExtensionMethods.cs
@@ -463,6 +463,9 @@ public static SimpleDataType ParseSimpleTypeString(string lowercaseString)
                 case "double":
                     simpleType = SimpleDataType.Double;
                     break;
+                case "decimal":
+                    simpleType = SimpleDataType.Decimal;
+                    break;
                 case "float":
                     simpleType = SimpleDataType.Float;
                     break;
diff --git a/ApiDoctor.Validation/OData/ExtensionMethods.cs b/ApiDoctor.Validation/OData/ExtensionMethods.cs
index cbc3c56c..64a68ce7 100644
--- a/ApiDoctor.Validation/OData/ExtensionMethods.cs
+++ b/ApiDoctor.Validation/OData/ExtensionMethods.cs
@@ -46,6 +46,7 @@ public static class ExtensionMethods
             { "Edm.DateTimeOffset", SimpleDataType.DateTimeOffset },
             { "Edm.Duration", SimpleDataType.Duration },
             { "Edm.Double", SimpleDataType.Double },
+            { "Edm.Decimal", SimpleDataType.Decimal },
             { "Edm.Float", SimpleDataType.Float },
             { "Edm.Guid", SimpleDataType.Guid },
             { "Edm.TimeOfDay", SimpleDataType.TimeOfDay},
diff --git a/ApiDoctor.Validation/ParameterDataType.cs b/ApiDoctor.Validation/ParameterDataType.cs
index 1db26887..d08b7cc7 100644
--- a/ApiDoctor.Validation/ParameterDataType.cs
+++ b/ApiDoctor.Validation/ParameterDataType.cs
@@ -297,10 +297,12 @@ internal bool JsonLooksDifferentFrom(ParameterDataType type)
                         type.Type != SimpleDataType.Int16 &&
                         type.Type != SimpleDataType.Int32 &&
                         type.Type != SimpleDataType.Int64;
+                case SimpleDataType.Decimal:
                 case SimpleDataType.Double:
                 case SimpleDataType.Float:
                 case SimpleDataType.Single:
                     return
+                        type.Type != SimpleDataType.Decimal &&
                         type.Type != SimpleDataType.Double &&
                         type.Type != SimpleDataType.Float &&
                         type.Type != SimpleDataType.Single;
@@ -374,7 +376,7 @@ We should never allow something from one tree to be considered less specific tha
             {
                 return true;
             }
-            else if (this.Type == SimpleDataType.Double && (type.Type == SimpleDataType.Float))
+            else if (this.Type == SimpleDataType.Decimal && (type.Type == SimpleDataType.Double || type.Type == SimpleDataType.Float))
             {
                 return true;
             }
@@ -418,6 +420,7 @@ static ParameterDataType()
             GenericObject = new ParameterDataType(SimpleDataType.Object);
             GenericCollection = new ParameterDataType(SimpleDataType.Object, true);
             Boolean = new ParameterDataType(SimpleDataType.Boolean);
+            Decimal = new ParameterDataType(SimpleDataType.Decimal);
             Double = new ParameterDataType(SimpleDataType.Double);
             Float = new ParameterDataType(SimpleDataType.Float);
             Guid = new ParameterDataType(SimpleDataType.Guid);
@@ -440,6 +443,10 @@ public static ParameterDataType GenericCollection
             get; private set;
         }
         public static ParameterDataType Boolean
+        {
+            get; private set;
+        } 
+        public static ParameterDataType Decimal
         {
             get; private set;
         }
@@ -493,6 +500,7 @@ public enum SimpleDataType
 
         Float,
         Double,
+        Decimal,
 
         Date,
         DateTimeOffset,
diff --git a/ApiDoctor.Validation/ParameterDefinition.cs b/ApiDoctor.Validation/ParameterDefinition.cs
index f74f54d0..677688a0 100644
--- a/ApiDoctor.Validation/ParameterDefinition.cs
+++ b/ApiDoctor.Validation/ParameterDefinition.cs
@@ -90,6 +90,7 @@ public JToken ToExampleJToken()
                         return new JValue(DateTime.Now.ToString("yyyy-MM-dd"));
                     case SimpleDataType.DateTimeOffset:
                         return new JValue(DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss.fffZ"));
+                    case SimpleDataType.Decimal:
                     case SimpleDataType.Double:
                     case SimpleDataType.Float:
                     case SimpleDataType.Single: