diff --git a/doc/manual.adoc b/doc/manual.adoc
index 3b460f7..6224658 100644
--- a/doc/manual.adoc
+++ b/doc/manual.adoc
@@ -30,8 +30,8 @@ intended behavior of the database.  Refer to <<_schema_file>> for a description
 of the contents of this file.  It is the only file which may be hand-edited.
 
 Each database also contains a `dtb` file, which contains the actual data.  This
-will be in CSV, pickle, or JSON format, depending on the contents of the
-`version` file.  It may also be compressed.
+will be in CSV (colon-separated values), pickle, or JSON format, depending on
+the contents of the `version` file.  It may also be compressed.
 
 The `dtb.checksum` file provides a cryptographic SHA-2 hash and length to ensure
 that the data has not been accidentally corrupted.  newfol will not open a