diff --git a/doc/manual.adoc b/doc/manual.adoc
index b4b978f..ddc5290 100644
--- a/doc/manual.adoc
+++ b/doc/manual.adoc
@@ -103,6 +103,12 @@ configuration file.
 Key field directives indicate the fields to display in the _Browse All Records_
 view.  By default, this value is 0 (display the first field).
 
+==== Column Directives (`col`)
+
+Column directives indicate how many columns to use to display fields.  A column
+directive consists of a record with the values `col` and an integer number of
+columns.
+
 === Configuration File
 
 Configuration files are identical to schema files except that instead of the