diff --git a/AutoTx/Email.cs b/AutoTx/Email.cs
index d678364a15c903a78d930779b7361b8adc0e0daf..f2b46894bfb03f83e2aad3908066b30c64bc9716 100644
--- a/AutoTx/Email.cs
+++ b/AutoTx/Email.cs
@@ -60,7 +60,7 @@ namespace AutoTx
         /// </summary>
         /// <param name="templateName">The file name of the template, without path.</param>
         /// <param name="substitions">A list of string-tuples to be used for the search-replace.</param>
-        /// <returns></returns>
+        /// <returns>The template with all patterns replaced by their substitution values.</returns>
         private static string LoadMailTemplate(string templateName, List<Tuple<string, string>> substitions) {
             var text = File.ReadAllText(
                 Path.Combine(AppDomain.CurrentDomain.BaseDirectory,