diff --git a/data/gui/default/window/addon_filter_options.cfg b/data/gui/default/window/addon_filter_options.cfg
index 569f67cc699..1d47fa8f109 100644
--- a/data/gui/default/window/addon_filter_options.cfg
+++ b/data/gui/default/window/addon_filter_options.cfg
@@ -15,6 +15,18 @@
 	[/column]
 #enddef
 
+#define _GUI_SPACER
+	[column]
+		grow_factor = 1
+		border = "all"
+		border_size = 5
+		horizontal_alignment = "left"
+
+		[spacer]
+		[/spacer]
+	[/column]
+#enddef
+
 #define _GUI_ADDON_TYPE_OPTIONS
 	[grid]
 
@@ -39,6 +51,10 @@
 			{_GUI_ADDON_TYPE_OPTION mp_maps _"addons_of_type^MP map-packs"}
 			{_GUI_ADDON_TYPE_OPTION unknown _"addons_of_type^Unknown"}
 		[/row]
+		[row]
+			{_GUI_ADDON_TYPE_OPTION mp_mods _"addons_of_type^MP modifications"}
+			{_GUI_SPACER}
+		[/row]
 
 	[/grid]
 #enddef
@@ -257,3 +273,4 @@
 #undef _GUI_ADDON_STATUS_OPTIONS
 #undef _GUI_ADDON_TYPE_OPTIONS
 #undef _GUI_ADDON_TYPE_OPTION
+#undef _GUI_SPACER
diff --git a/src/addon/info.cpp b/src/addon/info.cpp
index 0be4c3b64aa..103fe1251e2 100644
--- a/src/addon/info.cpp
+++ b/src/addon/info.cpp
@@ -159,6 +159,8 @@ std::string addon_info::display_type() const
 		return _("addon_type^MP scenario");
 	case ADDON_MP_CAMPAIGN:
 		return _("addon_type^MP campaign");
+	case ADDON_MP_MOD:
+		return _("addon_type^MP modification");
 	case ADDON_MEDIA:
 		return _("addon_type^Resources");
 	case ADDON_OTHER:
diff --git a/src/addon/validation.cpp b/src/addon/validation.cpp
index 993ff852831..143e881f28d 100644
--- a/src/addon/validation.cpp
+++ b/src/addon/validation.cpp
@@ -25,7 +25,7 @@ const unsigned short default_campaignd_port = 15006;
 namespace {
 	const std::string addon_type_strings[] = {
 		"unknown", "campaign", "scenario", "campaign_mp", "scenario_mp",
-		"map_pack", "era", "faction", /* "mod", "gui", */ "media", "other",
+		"map_pack", "era", "faction", "mod_mp", /*"gui", */ "media", "other",
 		""
 	};
 }
diff --git a/src/addon/validation.hpp b/src/addon/validation.hpp
index 56fb778190d..78eaf84f3d6 100644
--- a/src/addon/validation.hpp
+++ b/src/addon/validation.hpp
@@ -49,7 +49,7 @@ enum ADDON_TYPE {
 	ADDON_MP_ERA,		/**< Multiplayer era. */
 	ADDON_MP_FACTION,	/**< Multiplayer faction. */
 	// NOTE: following two still require proper engine support
-	//ADDON_MOD,			// Modification of the game for SP and/or MP.
+	ADDON_MP_MOD,		/**< Modification of the game for MP. */
 	//ADDON_GUI,			// GUI add-ons/themes.
 	ADDON_MEDIA,		/**< Miscellaneous content/media (unit packs, terrain packs, music packs, etc.). */
 	ADDON_OTHER,		/**< an add-on that fits in no other category */
diff --git a/src/gui/dialogs/addon/filter_options.cpp b/src/gui/dialogs/addon/filter_options.cpp
index 4538bb3179c..5e96670e9b1 100644
--- a/src/gui/dialogs/addon/filter_options.cpp
+++ b/src/gui/dialogs/addon/filter_options.cpp
@@ -60,6 +60,7 @@ taddon_filter_options::taddon_filter_options()
 	register_bool("show_mp_maps", true, displayed_types_[ADDON_MP_MAPS]);
 	register_bool("show_mp_eras", true, displayed_types_[ADDON_MP_ERA]);
 	register_bool("show_mp_factions", true, displayed_types_[ADDON_MP_FACTION]);
+	register_bool("show_mp_mods", true, displayed_types_[ADDON_MP_MOD]);
 	register_bool("show_media", true, displayed_types_[ADDON_MEDIA]);
 	// FIXME: (also in WML) should this and Unknown be a single option in the UI?
 	register_bool("show_other", true, displayed_types_[ADDON_OTHER]);