diff --git a/asn1c/asn1c.1 b/asn1c/asn1c.1
index c2f95ae..376d0fa 100644
--- a/asn1c/asn1c.1
+++ b/asn1c/asn1c.1
@@ -59,7 +59,7 @@
 Use the specified directory with ASN.1 skeleton files.
 .TP
 .B \-X
-Generate the XML DTD schema for the specified ASN.1 files.
+Generate an XML DTD schema for the specified ASN.1 files.
 .SH WARNING OPTIONS
 .TP
 .B \-Werror