diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2609fda..380218a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
 # LinDistFlow Changelog
 
-## dev
+## v0.5.1
 - add `get_line_amps`, `get_peak_line_amps_percent`, and `define_line_amps_pu`
+- mv SinglePhase `rij` and `xij` to CommonOPF
 
 ## v0.5.0
 - deprecate `get_edge_values` and `get_bus_values` in favor of `CommonOPF.get_variable_values`
diff --git a/Project.toml b/Project.toml
index a81a216..6e4ac8d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -10,6 +10,6 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 
 [compat]
-CommonOPF = "0.3.5"
+CommonOPF = "0.3.6"
 JuMP = "^0.21, 1.0"
 julia = "1"
diff --git a/src/LinDistFlow.jl b/src/LinDistFlow.jl
index 4548b96..19e11f1 100644
--- a/src/LinDistFlow.jl
+++ b/src/LinDistFlow.jl
@@ -1,6 +1,7 @@
 module LinDistFlow
 
 using CommonOPF
+import CommonOPF: rij, xij  # extending to MultiPhase, need to consolidate into CommonOPF
 using JuMP
 using LinearAlgebra
 import SparseArrays: sparse
diff --git a/src/utils.jl b/src/utils.jl
index 46d6afa..05d0418 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -1,12 +1,4 @@
-
-function rij(i::String, j::String, p::Inputs{SinglePhase})
-    linecode = get_ijlinecode(i, j, p)
-    linelength = get_ijlinelength(i, j, p)
-    rmatrix = p.Zdict[linecode]["rmatrix"] * linelength / p.Zbase
-    return rmatrix[1]
-end
-
-
+# TODO mv MultiPhase rij xij to CommonOPF (requires something new to handle BFM vs. LDF)
 function rij(i::String, j::String, p::Inputs{MultiPhase})
     linecode = get_ijlinecode(i, j, p)
     linelength = get_ijlinelength(i, j, p)
@@ -30,14 +22,6 @@ function rij(i::String, j::String, p::Inputs{MultiPhase})
 end
 
 
-function xij(i::String, j::String, p::Inputs{SinglePhase})
-    linecode = get_ijlinecode(i, j, p)
-    linelength = get_ijlinelength(i, j, p)
-    xmatrix = p.Zdict[linecode]["xmatrix"] * linelength / p.Zbase
-    return xmatrix[1]
-end
-
-
 function xij(i::String, j::String, p::Inputs{MultiPhase})
     linecode = get_ijlinecode(i, j, p)
     linelength = get_ijlinelength(i, j, p)