dpkg-buildpackage(1): Clarify --check-option description

Reported-by: Helge Kreutzmann <debian@helgefjell.de>

debian/changelog

@@ -5,6 +5,7 @@ dpkg (1.17.7) UNRELEASED; urgency=low
     - Mention in deb-symbols(5), that the “main-dependency-template” is
       always used. Closes: #737731
     - Clarify in deb-control(5) «Multi-Arch: no» field omission.
+    - Clarify in dpkg-buildpackage(1) --check-option description.
 
   [ Updated dpkg translations ]
   * German (Sven Joachim).

man/dpkg-buildpackage.1

@@ -214,7 +214,8 @@ referenced in the file. The command should take the \fB.changes\fP pathname
 as an argument. This command will usually be \fBlintian\fP.
 .TP
 .BI \-\-check\-option= opt
-Pass option \fIopt\fP to \fIcheck-command\fP.
+Pass option \fIopt\fP to the \fIcheck-command\fP specified with
+\fBDEB_CHECK_COMMAND\fP or \fB\-\-check\-command\fP.
 .TP
 .BI \-\-hook\- hook-name = hook-command
 Set the specified shell code \fIhook-command\fP as the hook \fIhook-name\fP,