diff --git a/src/gaemstone.SourceGen/Structure/ParameterInfo.cs b/src/gaemstone.SourceGen/Structure/ParameterInfo.cs
index 3a99022..eeeabdb 100644
--- a/src/gaemstone.SourceGen/Structure/ParameterInfo.cs
+++ b/src/gaemstone.SourceGen/Structure/ParameterInfo.cs
@@ -87,6 +87,12 @@ public class ParameterInfo : BaseInfo
 			{
 				TermTypes = ImmutableList.Create(Symbol.Type);
 				FieldType = Symbol.Type;
+
+				// If the type of the parameter has the [Tag] attribute,
+				// the only way to sensibly use it is to check for its (non-)existance.
+				// (This would also apply to [Relation, Tag] but should be no issue.)
+				if (Symbol.Type.HasAttribute("gaemstone.ECS.TagAttribute")) isHas = true;
+				// TODO: Make sure [Tag] is used appropriately.
 			}
 
 			Source = Get("Source")?.AttributeClass!.TypeArguments[0]