diff --git a/src/MDConcMarkingPosition.php b/src/MDConcMarkingPosition.php
index c95ba0a..27dd04c 100644
--- a/src/MDConcMarkingPosition.php
+++ b/src/MDConcMarkingPosition.php
@@ -60,12 +60,14 @@ final class MDConcMarkingPosition implements MDImporterConcordanceListInterface
         "Unterboden" => "bottom",
         "vs unten" => "bottom",
         "untere Passpartoutkante" => "bottom",
+        "unten mittig" => "bottom",
         "Unten mittig" => "bottom",
         "Unten mittig auf Platte" => "bottom",
 
         // Top
         "oben" => "top",
         "oben mittig" => "top",
+        "Oben mittig" => "top",
         "Oberseite" => "top",
         "oberer Rand" => "top",
         "oberer Balken" => "top",
@@ -162,6 +164,7 @@ final class MDConcMarkingPosition implements MDImporterConcordanceListInterface
         "Rückseite rechts" => "rear_side",
         "Rückseite, rechts" => "rear_side",
         "Rückseite rechts oben" => "rear_side",
+        "Rückseite unten" => "rear_side",
         "Rückseite, unten" => "rear_side",
         "Rückseite, unten links" => "rear_side",
         "Rückseite, unten mittig" => "rear_side",