diff --git a/GROUPS.md b/GROUPS.md
index 3f3ddc0e..00ebd742 100644
--- a/GROUPS.md
+++ b/GROUPS.md
@@ -90,6 +90,7 @@ These groups are used mostly for informational purposes
 * `bed=1`: Bed
 * `door=1`: Door
 * `door=2`: Trapdoor
+* `glass=1`: Glass (full cubes only)
 * `rail=1`: Rail
 * `music_record`: Music Disc (rating is track ID)
 * `tnt=1`: Block is TNT
diff --git a/mods/ITEMS/mcl_core/functions.lua b/mods/ITEMS/mcl_core/functions.lua
index 1105bc97..47f3a21d 100644
--- a/mods/ITEMS/mcl_core/functions.lua
+++ b/mods/ITEMS/mcl_core/functions.lua
@@ -577,7 +577,7 @@ function mcl_core.add_glass(desc, recipeitem, color)
 		paramtype = "light",
 		use_texture_alpha = true,
 		stack_max = 64,
-		groups = {handy=1, building_block=1},
+		groups = {handy=1, glass=1, building_block=1},
 		sounds = mcl_sounds.node_sound_glass_defaults(),
 		drop = "",
 		_mcl_blast_resistance = 1.5,
diff --git a/mods/ITEMS/mcl_core/nodes.lua b/mods/ITEMS/mcl_core/nodes.lua
index 69956a25..6bda34f5 100644
--- a/mods/ITEMS/mcl_core/nodes.lua
+++ b/mods/ITEMS/mcl_core/nodes.lua
@@ -1116,7 +1116,7 @@ minetest.register_node("mcl_core:glass", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	stack_max = 64,
-	groups = {handy=1, building_block=1},
+	groups = {handy=1, glass=1, building_block=1},
 	sounds = mcl_sounds.node_sound_glass_defaults(),
 	drop = "",
 	_mcl_blast_resistance = 1.5,