diff --git a/extras/blanudmf/Includes/BlanKart_linedefs.cfg b/extras/blanudmf/Includes/BlanKart_linedefs.cfg
index 88d09bfa7..43da97f83 100644
--- a/extras/blanudmf/Includes/BlanKart_linedefs.cfg
+++ b/extras/blanudmf/Includes/BlanKart_linedefs.cfg
@@ -4089,6 +4089,39 @@ udmf
 			}
 		}
 
+		777
+		{
+			title = "Create Anchor-Based Slope";
+			prefix = "(777)";
+			requiresactivation = false;
+			arg0
+			{
+				title = "Planes";
+				type = 12;
+				enum
+				{
+					1 = "Floor";
+					2 = "Ceiling";
+				}
+			}
+			arg1
+			{
+				title = "Flags";
+				type = 12;
+				enum
+				{
+					1 = "No physics";
+					2 = "Dynamic";
+					4 = "Slope backside";
+					8 = "Mirror plane";
+				}
+			}
+			arg2
+			{
+				title = "Group";
+			}
+		}
+
 		799
 		{
 			title = "Set Tagged Dynamic Slope Vertex to Front Sector Height";
diff --git a/extras/blanudmf/Includes/BlanKart_things.cfg b/extras/blanudmf/Includes/BlanKart_things.cfg
index eb6c14342..a94937571 100644
--- a/extras/blanudmf/Includes/BlanKart_things.cfg
+++ b/extras/blanudmf/Includes/BlanKart_things.cfg
@@ -2238,12 +2238,20 @@ udmf
 		{
 			title = "Floor Slope Anchor";
 			sprite = "SAFA0";
+			arg0
+			{
+				title = "Group";
+			}
 		}
 
 		778
 		{
 			title = "Ceiling Slope Anchor";
 			sprite = "SACA0";
+			arg0
+			{
+				title = "Group";
+			}
 		}
 		780
 		{