--- a/API/Objects/Requirement/IRequirement.cs	Sun May 01 19:16:23 2011 +0000
+++ b/API/Objects/Requirement/IRequirement.cs	Sun May 01 19:17:40 2011 +0000
@@ -45,6 +45,20 @@
 		/// The army to validate.
 		/// </param>
 		string GetValidationMessage(Army army);
+
+		/// <summary>
+		/// Gets the validation message for adding a unit to the army
+		/// </summary>
+		/// <returns>
+		/// A validation message, if the type cannot be added, else an empty string.
+		/// </returns>
+		/// <param name='toAdd'>
+		/// The unit type to try to add
+		/// </param>
+		/// <param name='toArmy'>
+		/// The army the unit will be added to
+		/// </param>
+		string GetAllowsAddingMessage(UnitType toAdd, Army toArmy);
 	}
 }