diff --git a/Sources/SymbolKit/SymbolGraph/Platform.swift b/Sources/SymbolKit/SymbolGraph/Platform.swift
index d261a32..55ccbd6 100644
--- a/Sources/SymbolKit/SymbolGraph/Platform.swift
+++ b/Sources/SymbolKit/SymbolGraph/Platform.swift
@@ -49,13 +49,10 @@ extension SymbolGraph {
             switch os {
             case "macosx", "macos":
                 return SymbolGraph.Symbol.Availability.Domain.macOS
+            case "ios" where environment == "macabi":
+                return SymbolGraph.Symbol.Availability.Domain.macCatalyst
             case "ios":
-                if environment == "macabi" {
-                    return SymbolGraph.Symbol.Availability.Domain.macCatalyst
-
-                } else {
-                    return SymbolGraph.Symbol.Availability.Domain.iOS
-                }
+                return SymbolGraph.Symbol.Availability.Domain.iOS
             case "watchos":
                 return SymbolGraph.Symbol.Availability.Domain.watchOS
             case "tvos":
@@ -65,7 +62,7 @@ extension SymbolGraph {
             case "linux":
                 return SymbolGraph.Symbol.Availability.Domain.linux
             default:
-                return "Unsupported OS: \(os)"
+                return os
             }
         }
 
diff --git a/Tests/SymbolKitTests/SymbolGraph/PlatformTests.swift b/Tests/SymbolKitTests/SymbolGraph/PlatformTests.swift
index 800fe57..26aa008 100644
--- a/Tests/SymbolKitTests/SymbolGraph/PlatformTests.swift
+++ b/Tests/SymbolKitTests/SymbolGraph/PlatformTests.swift
@@ -1,7 +1,7 @@
 /*
  This source file is part of the Swift.org open source project
 
- Copyright (c) 2021 Apple Inc. and the Swift project authors
+ Copyright (c) 2021-2024 Apple Inc. and the Swift project authors
  Licensed under Apache License v2.0 with Runtime Library Exception
 
  See https://swift.org/LICENSE.txt for license information
@@ -35,15 +35,15 @@ class PlatformTests: XCTestCase {
         }
     }
 
-    func testInvalidOperatingSystemName() {
+    func testUnknownOperatingSystemName() {
         let platform = SymbolGraph.Platform(
             architecture: nil,
             vendor: nil,
-            operatingSystem: SymbolGraph.OperatingSystem(name: "invalidos"),
+            operatingSystem: SymbolGraph.OperatingSystem(name: "unknown"),
             environment: nil
         )
 
-        XCTAssertEqual(platform.name, "Unsupported OS: invalidos")
+        XCTAssertEqual(platform.name, "unknown")
     }
 
     func testMacCatalystName() {
@@ -56,4 +56,14 @@ class PlatformTests: XCTestCase {
 
         XCTAssertEqual(platform.name, "macCatalyst", "'ios' should return macCatalyst when set with 'macabi'.")
     }
+    
+    func testiOSName() {
+            let platform = SymbolGraph.Platform(
+                architecture: nil,
+                vendor: nil,
+                operatingSystem: SymbolGraph.OperatingSystem(name: "ios")
+            )
+
+            XCTAssertEqual(platform.name, "iOS", "'ios' should return iOS when set with no `macabi` environment.")
+        }
 }