diff --git a/Models/ThemeConfig/SourceConfig.ts b/Models/ThemeConfig/SourceConfig.ts
index 1badbc57b..7ad564764 100644
--- a/Models/ThemeConfig/SourceConfig.ts
+++ b/Models/ThemeConfig/SourceConfig.ts
@@ -57,7 +57,9 @@ export default class SourceConfig {
                 throw (
                     "Error at " +
                     context +
-                    ": the specified tags are conflicting with each other: they will never match anything at all"
+                    ": the specified tags are conflicting with each other: they will never match anything at all.\n" +
+                    "\tThe offending tags are: "+params.osmTags.asHumanString(false, false, {})+
+                        "\tThey optmize into 'false' "
                 )
             }
             if (optimized === true) {