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+# F# RFC FS-NNNN - [<RequireNamedArgument>] attribute
+
+The design suggestion [Add an attribute enforcing the use of named argument at callsite
+](https://github.com/fsharp/fslang-suggestions/issues/414) has been marked "approved in principle".
+
+
+This RFC covers the detailed proposal for this suggestion.
+
+- [x] Approved in principle
+- [ ] [Suggestion](https://github.com/fsharp/fslang-suggestions/issues/fill-me-in)
+- [ ] [Implementation](https://github.com/dotnet/fsharp/pull/FILL-ME-IN)
+- [ ] Design Review Meeting(s) with @dsyme and others invitees
+- [Discussion](https://github.com/fsharp/fslang-design/issues/PLEASE-ADD-A-DISCUSSION-ISSUE-AND-LINK-HERE)
+
+# Summary
+
+Allow to enforce usage of named arguments to method call sites by annotating `[<RequireNamedArgument>]` on the method definition.
+
+# Motivation
+
+This allows an API designer to enforce call sites abide to design choices in similar fashion to the existing attributes `RequireQualifiedAccess` and `RequiresExplicitTypeArguments`.
+
+Applying the `RequireNamedArgument` attribute to the method definition will enforce call sites to use the named argument syntax.
+
+This is most useful in cases where subsequent arguments of same type can be confusing or prone to introducing bugs at call sites or during refactorings. 
+
+This impacts some type providers where the order of parameter of a type provided member may switch due to adjustment of the input provided to a type provider.
+
+# Detailed design
+
+Basic example:
+
+```fsharp
+type A() =
+  
+  static member x.B(dividend:int, divisor:int) = dividend / divisor
+  
+  [<RequireNamedArgument>]
+  static member x.C(dividend:int, divisor:int) = dividend / divisor
+
+A.B(0, 15) // OK
+A.C(0, 15) // Not OK
+A.C(dividend=0, divisor=15) // OK
+```
+
+Error message:
+
+`The method '%s' has the 'RequireNamedArgumentAttribute' attribute specified, use the named arguments syntax (e.g. 'MethodName(x = value)').`
+
+# Drawbacks
+
+* People consuming API using the feature may not adhere to the design choice made in the API design
+* Record types could be used for similar effect (but type providers don't have the facility to generate those at this time)
+* Increases FSharp.Core footprint
+
+# Alternatives
+
+Using record types.
+
+# Compatibility
+
+## Is this a breaking change?
+
+It is not a breaking change.
+
+## What happens when previous versions of the F# compiler encounter this design addition as source code?
+
+Code would still compile but the rule won't be enforced. 
+
+## What happens when previous versions of the F# compiler encounter this design addition in compiled binaries?
+
+Code would still compile but the rule won't be enforced. 
+
+## If this is a change or extension to FSharp.Core, what happens when previous versions of the F# compiler encounter this construct?
+
+Code would still compile but the rule won't be enforced. 
+
+# Unresolved questions
+
+Whether the attribute would find a way to the BCL and support by other compilers.
+
+Does the compiler errors if the attribute is used on a function? or a warning? or ignored?
+
+What happens when the attribute is put on a virtual method but not on an overriden one?
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