diff --git a/src/MDConcLicenses.php b/src/MDConcLicenses.php
index 58a60fb..e8ff978 100644
--- a/src/MDConcLicenses.php
+++ b/src/MDConcLicenses.php
@@ -31,6 +31,10 @@ final class MDConcLicenses implements MDImporterConcordanceListInterface {
         "CC_BY" => "CC BY",
         "CC-BY" => "CC BY",
         "CC.BY" => "CC BY",
+        "CC BY 4.0" => "CC BY",
+        "CC_BY 4.0" => "CC BY",
+        "CC-BY 4.0" => "CC BY",
+        "CC.BY 4.0" => "CC BY",
         "http://creativecommons.org/licenses/by/4.0" => "CC BY",
         "http://creativecommons.org/licenses/by/4.0/" => "CC BY",
         "http://creativecommons.org/licenses/by/4.0/de" => "CC BY",