diff --git a/src/fsharp/FSharp.Core/async.fsi b/src/fsharp/FSharp.Core/async.fsi
index 3d7f369f568..d3432838f6f 100644
--- a/src/fsharp/FSharp.Core/async.fsi
+++ b/src/fsharp/FSharp.Core/async.fsi
@@ -17,7 +17,7 @@ namespace Microsoft.FSharp.Control
///
///
/// This type has no members. Asynchronous computations are normally specified either by using an async expression
- /// or the static methods in the type.
+ /// or the static methods in the type.
///
/// See also F# Language Guide - Async Workflows.
///
diff --git a/src/fsharp/FSharp.Core/map.fsi b/src/fsharp/FSharp.Core/map.fsi
index 3d0ee8c03de..47e6f807c68 100644
--- a/src/fsharp/FSharp.Core/map.fsi
+++ b/src/fsharp/FSharp.Core/map.fsi
@@ -215,7 +215,7 @@ type Map<[]'Key,[
override Equals : obj -> bool
-/// Contains operations for working with values of type .
+/// Contains operations for working with values of type .
[]
[]
module Map =
diff --git a/src/fsharp/FSharp.Core/result.fsi b/src/fsharp/FSharp.Core/result.fsi
index 1be6745cbee..5380ba371dc 100644
--- a/src/fsharp/FSharp.Core/result.fsi
+++ b/src/fsharp/FSharp.Core/result.fsi
@@ -4,7 +4,7 @@ namespace Microsoft.FSharp.Core
open Microsoft.FSharp.Core.LanguagePrimitives.IntrinsicOperators
- /// Contains operations for working with values of type .
+ /// Contains operations for working with values of type .
///
/// Choices and Results
[]
diff --git a/src/fsharp/FSharp.Core/set.fsi b/src/fsharp/FSharp.Core/set.fsi
index 1c821a6dda1..a33caab6aa5 100644
--- a/src/fsharp/FSharp.Core/set.fsi
+++ b/src/fsharp/FSharp.Core/set.fsi
@@ -239,7 +239,7 @@ open System.Collections.Generic
open Microsoft.FSharp.Core
open Microsoft.FSharp.Collections
-/// Contains operations for working with values of type .
+/// Contains operations for working with values of type .
[]
[]
module Set =