diff --git a/doc/manual.adoc b/doc/manual.adoc
index cf87ba185..fc1d8c1aa 100644
--- a/doc/manual.adoc
+++ b/doc/manual.adoc
@@ -264,6 +264,9 @@ TIGRC_USER::
 TIGRC_SYSTEM::
 	Path of the system wide configuration file.
 
+TIGRC_EXTRA::
+	Path of the additional configuration file.
+
 [[history-files]]
 History Files
 ~~~~~~~~~~~~~
diff --git a/doc/tig.1.adoc b/doc/tig.1.adoc
index 30b60e31b..e0919dae5 100644
--- a/doc/tig.1.adoc
+++ b/doc/tig.1.adoc
@@ -206,6 +206,9 @@ TIGRC_SYSTEM::
 	`{sysconfdir}/tigrc`). Define to empty string to use built-in
 	configuration.
 
+TIGRC_EXTRA::
+	Path of the additional configuration file.
+
 TIG_LS_REMOTE::
 	Command for retrieving all repository references. The command
 	should output data in the same format as git-ls-remote(1).
diff --git a/src/options.c b/src/options.c
index cb1177a8d..352af67a2 100644
--- a/src/options.c
+++ b/src/options.c
@@ -1013,6 +1013,7 @@ enum status_code
 load_options(void)
 {
 	const char *tigrc_user = getenv("TIGRC_USER");
+	const char *tigrc_extra = getenv("TIGRC_EXTRA");
 	const char *tigrc_system = getenv("TIGRC_SYSTEM");
 	const char *tig_diff_opts = getenv("TIG_DIFF_OPTS");
 	const bool diff_opts_from_args = !!opt_diff_options;
@@ -1053,6 +1054,10 @@ load_options(void)
 			load_option_file(TIG_USER_CONFIG);
 	}
 
+	if (tigrc_extra) {
+		load_option_file(tigrc_extra);
+	}
+
 	if (!diff_opts_from_args && tig_diff_opts && *tig_diff_opts) {
 		static const char *diff_opts[SIZEOF_ARG] = { NULL };
 		char buf[SIZEOF_STR];