diff --git a/src/OptionalValues/IOptionalValue.cs b/src/OptionalValues/IOptionalValue.cs
new file mode 100644
index 0000000..5f9ff77
--- /dev/null
+++ b/src/OptionalValues/IOptionalValue.cs
@@ -0,0 +1,12 @@
+namespace OptionalValues;
+
+/// <summary>
+/// Represents an optional value that may or may not be specified.
+/// </summary>
+public interface IOptionalValue
+{
+    /// <summary>
+    /// Whether the value is specified.
+    /// </summary>
+    bool IsSpecified { get; }
+}
diff --git a/src/OptionalValues/Internal/IOptionalValueInternals.cs b/src/OptionalValues/Internal/IOptionalValueInternals.cs
index d8eec72..d0676ee 100644
--- a/src/OptionalValues/Internal/IOptionalValueInternals.cs
+++ b/src/OptionalValues/Internal/IOptionalValueInternals.cs
@@ -1,9 +1,7 @@
-namespace OptionalValues.Internal;
+namespace OptionalValues.Internal;
 
-internal interface IOptionalValueInternals
+internal interface IOptionalValueInternals : IOptionalValue
 {
-    bool IsSpecified { get; }
-
     object? GetValue();
 
     object? GetSpecifiedValue();
diff --git a/src/OptionalValues/PublicAPI.Unshipped.txt b/src/OptionalValues/PublicAPI.Unshipped.txt
index e69de29..4ae5f0c 100644
--- a/src/OptionalValues/PublicAPI.Unshipped.txt
+++ b/src/OptionalValues/PublicAPI.Unshipped.txt
@@ -0,0 +1,3 @@
+#nullable enable
+OptionalValues.IOptionalValue
+OptionalValues.IOptionalValue.IsSpecified.get -> bool
\ No newline at end of file
diff --git a/test/OptionalValues.Tests/OptionalValueTest.cs b/test/OptionalValues.Tests/OptionalValueTest.cs
index 0bed92b..3714be2 100644
--- a/test/OptionalValues.Tests/OptionalValueTest.cs
+++ b/test/OptionalValues.Tests/OptionalValueTest.cs
@@ -55,6 +55,25 @@ public void Should_Be_True_For(string? value)
         }
     }
 
+    public class PublicInterface : OptionalValueTest
+    {
+        [Fact]
+        public void Should_Be_Implemented_By_OptionalValue()
+        {
+            IOptionalValue sut = new OptionalValue<string?>("Value");
+
+            sut.IsSpecified.ShouldBeTrue();
+        }
+
+        [Fact]
+        public void Should_Expose_Unspecified_State()
+        {
+            IOptionalValue sut = OptionalValue<string?>.Unspecified;
+
+            sut.IsSpecified.ShouldBeFalse();
+        }
+    }
+
     public class Value : OptionalValueTest
     {
         [Fact]