diff --git a/docs.md b/docs.md
index 38eb2b1..8dfc8ee 100644
--- a/docs.md
+++ b/docs.md
@@ -307,6 +307,7 @@ Thrusters = {
         primary_altitude_thruster = true,
         primary_fore_thruster = false,
         primary_aft_thruster = false,
+        x_config_equivalent = "1", -- if you're running a standard x configuration, what prop is this equivalent to?
         type = "rotator",
         name = "gyroscopic_propeller_bearing_0",
         thruster = nil,
@@ -334,6 +335,7 @@ Thrusters = {
         primary_altitude_thruster = true,
         primary_fore_thruster = false,
         primary_aft_thruster = false,
+        x_config_equivalent = "2", -- if you're running a standard x configuration, what prop is this equivalent to?
         type = "rotator",
         name = "gyroscopic_propeller_bearing_1",
         thruster = nil,
@@ -361,6 +363,7 @@ Thrusters = {
         primary_altitude_thruster = true,
         primary_fore_thruster = false,
         primary_aft_thruster = false,
+        x_config_equivalent = "4", -- if you're running a standard x configuration, what prop is this equivalent to?
         type = "rotator",
         name = "gyroscopic_propeller_bearing_2",
         thruster = nil,
@@ -388,6 +391,7 @@ Thrusters = {
         primary_altitude_thruster = true,
         primary_fore_thruster = false,
         primary_aft_thruster = false,
+        x_config_equivalent = "3", -- if you're running a standard x configuration, what prop is this equivalent to?
         type = "rotator",
         name = "gyroscopic_propeller_bearing_3",
         thruster = nil,
diff --git a/thrusters.txt.example b/thrusters.txt.example
index 78ca4f0..261fb30 100644
--- a/thrusters.txt.example
+++ b/thrusters.txt.example
@@ -6,6 +6,7 @@ return {
         primary_altitude_thruster = true,
         primary_fore_thruster = false,
         primary_aft_thruster = false,
+        x_config_equivalent = "1",
         type = "rotator",
         name = "gyroscopic_propeller_bearing_0",
         thruster = nil,
@@ -31,6 +32,7 @@ return {
         primary_altitude_thruster = true,
         primary_fore_thruster = false,
         primary_aft_thruster = false,
+        x_config_equivalent = "2",
         type = "rotator",
         name = "gyroscopic_propeller_bearing_1",
         thruster = nil,
@@ -56,6 +58,7 @@ return {
         primary_altitude_thruster = true,
         primary_fore_thruster = false,
         primary_aft_thruster = false,
+        x_config_equivalent = "4",
         type = "rotator",
         name = "gyroscopic_propeller_bearing_2",
         thruster = nil,
@@ -81,6 +84,7 @@ return {
         primary_altitude_thruster = true,
         primary_fore_thruster = false,
         primary_aft_thruster = false,
+        x_config_equivalent = "3",
         type = "rotator",
         name = "gyroscopic_propeller_bearing_3",
         thruster = nil,