diff --git a/mdoc/Consts.cs b/mdoc/Consts.cs
index 12d166fe..6f4650c2 100644
--- a/mdoc/Consts.cs
+++ b/mdoc/Consts.cs
@@ -3,7 +3,7 @@ namespace Mono.Documentation
 {
     public static class Consts
     {
-        public static string MonoVersion = "5.9.6";
+        public static string MonoVersion = "5.9.7";
         public const string DocId = "DocId";
         public const string CppCli = "C++ CLI";
         public const string CppCx = "C++ CX";
diff --git a/mdoc/Mono.Documentation/MDocUpdater.cs b/mdoc/Mono.Documentation/MDocUpdater.cs
index 8b47ca71..180039da 100644
--- a/mdoc/Mono.Documentation/MDocUpdater.cs
+++ b/mdoc/Mono.Documentation/MDocUpdater.cs
@@ -3944,15 +3944,33 @@ public void MakeParameters (XmlElement root, MemberReference member, IList<Param
 
                 pe.SetAttribute ("Name", param.Name);
                 pe.SetAttribute ("Type", paramType);
-                if (param.ParameterType is ByReferenceType)
+
+                TypeReference parameterType = param.ParameterType;
+                if (parameterType is RequiredModifierType requiredModifierType)
+                {
+                    switch (requiredModifierType.ModifierType.FullName)
+                    {
+                        case Consts.InAttribute:
+                            pe.SetAttribute("RefType", "in");
+                            break;
+                        case Consts.OutAttribute:
+                            pe.SetAttribute("RefType", "out");
+                            break;
+                    }
+                    parameterType = requiredModifierType.ElementType;
+                }
+                if (parameterType is ByReferenceType)
                 {
                     if (param.IsOut)
-                        pe.SetAttribute ("RefType", "out");
+                        pe.SetAttribute("RefType", "out");
+                    else if (param.IsIn && DocUtils.HasCustomAttribute(param, Consts.IsReadOnlyAttribute))
+                        pe.SetAttribute("RefType", "in");
                     else
-                        pe.SetAttribute ("RefType", "ref");
+                        pe.SetAttribute("RefType", "ref");
                 }
+
                 //if (addIndex)
-                    pe.SetAttribute (Consts.Index, index.ToString ());
+                pe.SetAttribute (Consts.Index, index.ToString ());
                 //if (addfx)
                     pe.SetAttribute (Consts.FrameworkAlternate, fx);
 
diff --git a/mdoc/Mono.Documentation/Updater/Formatters/DocIdFormatter.cs b/mdoc/Mono.Documentation/Updater/Formatters/DocIdFormatter.cs
index ec41000e..72c8530b 100644
--- a/mdoc/Mono.Documentation/Updater/Formatters/DocIdFormatter.cs
+++ b/mdoc/Mono.Documentation/Updater/Formatters/DocIdFormatter.cs
@@ -16,17 +16,16 @@ public DocIdFormatter(TypeMap map) : base(map)
             slashDocMemberFormatter = new SlashDocMemberFormatter(map);
         }
 
-        public override string GetDeclaration (TypeReference tref)
+        public override string GetDeclaration(TypeReference tref)
         {
-            return DocCommentId.GetDocCommentId (tref.Resolve ());
+            return DocCommentId.GetDocCommentId(tref.Resolve());
         }
-        public override string GetDeclaration (MemberReference mreference)
+        public override string GetDeclaration(MemberReference mreference)
         {
-            if (mreference is AttachedEventReference || mreference is AttachedPropertyReference)
-            {
-                return slashDocMemberFormatter.GetDeclaration(mreference);
-            }
-            return DocCommentId.GetDocCommentId (mreference.Resolve ());
+            string ret = mreference is AttachedEventReference || mreference is AttachedPropertyReference
+                ? slashDocMemberFormatter.GetDeclaration(mreference)
+                : DocCommentId.GetDocCommentId(mreference.Resolve());
+            return ret.Replace("|System.Runtime.InteropServices.InAttribute", string.Empty);
         }
     }
 }
\ No newline at end of file
diff --git a/mdoc/mdoc.nuspec b/mdoc/mdoc.nuspec
index f7825501..7d0b3c75 100644
--- a/mdoc/mdoc.nuspec
+++ b/mdoc/mdoc.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>mdoc</id>
-    <version>5.9.6</version>
+    <version>5.9.7</version>
     <title>mdoc</title>
     <authors>Microsoft</authors>
     <owners>Microsoft</owners>