@@ -36,5 +36,10 @@ namespace Datadog.Trace
         /// The span type for a GraphQL integration.
         /// </summary>
         public const string GraphQL = "graphql";
+
+        /// <summary>
+        /// The span type for a custom integration.
+        /// </summary>
+        public const string Custom = "custom";
     }
 }
namespace Datadog.Trace
{
    /// <summary>
    /// A set of standard span types that can be used by integrations.
    /// Not to be confused with span kinds.
    /// </summary>
    /// <seealso cref="SpanKinds"/>
    public static class SpanTypes
    {
        /// <summary>
        /// The span type for a Redis client integration.
        /// </summary>
        public const string Redis = "redis";

        /// <summary>
        /// The span type for a SQL client integration.
        /// </summary>
        public const string Sql = "sql";

        /// <summary>
        /// The span type for a web framework integration (incoming HTTP requests).
        /// </summary>
        public const string Web = "web";

        /// <summary>
        /// The span type for a MongoDB integration.
        /// </summary>
        public const string MongoDb = "mongodb";

        /// <summary>
        /// The span type for an outgoing HTTP integration.
        /// </summary>
        public const string Http = "http";

        /// <summary>
        /// The span type for a GraphQL integration.
        /// </summary>
        public const string GraphQL = "graphql";
    }
}

I didn't see where this span type was used in this PR, but it will be good to have this nonetheless.