diff --git a/doc/mgba-qt.6 b/doc/mgba-qt.6
index 5346ddb47..256384721 100644
--- a/doc/mgba-qt.6
+++ b/doc/mgba-qt.6
@@ -93,6 +93,15 @@ configuration file.
 Default
 .Nm mgba-qt
 configuration file.
+.It Pa portable.ini
+If this file exists in the current directory,
+.Nm
+will read
+.Pa config.ini
+and
+.Pa qt.ini
+from the current directory instead of
+.Pa ~/.config/mgba .
 .El
 .Sh AUTHORS
 .An Jeffrey Pfau Aq Mt jeffrey@endrift.com
diff --git a/doc/mgba.6 b/doc/mgba.6
index 452b2282b..1cd69d202 100644
--- a/doc/mgba.6
+++ b/doc/mgba.6
@@ -225,6 +225,13 @@ Break into the attached debugger.
 Default
 .Nm
 configuration file.
+.It Pa portable.ini
+If this file exists in the current directory,
+.Nm
+will read
+.Pa config.ini
+from the current directory instead of
+.Pa ~/.config/mgba .
 .El
 .Sh AUTHORS
 .An Jeffrey Pfau Aq Mt jeffrey@endrift.com