diff --git a/doc/hackerbase.1 b/doc/hackerbase.1
index be16e02..58790ee 100644
--- a/doc/hackerbase.1
+++ b/doc/hackerbase.1
@@ -264,7 +264,7 @@ transaction file.
 
 The CSV files with bank account statements are stored in the directory
 specified "bank-dir" key in \fBCONFIGURATION\fR or given as
-command-line option \fB-bankdir\fR.
+command-line option \fB\-bankdir\fR.
 
 In the directory with bank account statements a subdirectory named
 "parts/" is maintained which contains the account statements for
@@ -278,6 +278,15 @@ bank API.
 
 .SS Last Checked Transaction ID File
 
+A file specified under the "jendasap-checked" key in
+\fBCONFIGURATION\fR or given as command-line option \fB\-checked\fR
+contains the ID of the last checked bank transaction across all bank
+account statements.
+
+When checking for \fB\-unpaired\fR transactions, only transactions
+with ID greater than the numeric value stored in this file are
+considered.
+
 .SH "CONFIGURATION"
 
 it is in /etc/hackerbase