diff --git a/import/import.properties b/import/import.properties
index 2b4b9ccad6f5bbf790a8a3d3a984741174ec7142..fb1a64b6078ea51c9c39fbb3f62ac12815fd06b0 100644
--- a/import/import.properties
+++ b/import/import.properties
@@ -31,3 +31,17 @@ marc.to_utf_8 = true
 marc.permissive = true
 marc.default_encoding = BESTGUESS
 marc.include_errors = true
+
+# Perform Unicode normalization.
+#
+# Allowed values are:
+#
+#   C  - Normalization Form C (NFC)
+#   D  - Normalization Form D (NFD)
+#   KC - Normalization Form KC (NFKC)
+#   KD - Normalization Form KD (NFKD)
+#
+# For the differences of the normalization forms see the Unicode
+# Standards Annex #15, located at <http://unicode.org/reports/tr15/>.
+#
+# marc.unicode_normalize = C