-.SH ENVIRONMENT VARIABLES
-.IP NOTMUCH_CONFIG
-Specifies the location of the configuration file to override the default of
-.IR ~/.notmuch-config .
+.SH ENVIRONMENT
+The following environment variables can be used to control the
+behavior of notmuch.
+.TP
+.B NOTMUCH_CONFIG
+Specifies the location of the notmuch configuration file. Notmuch will
+use ${HOME}/.notmuch-config if this variable is not set.