Update README.md

README.md

@@ -10,5 +10,12 @@ M and N are the LHS and RHS of the linear system respectivelly.
 
 Included problems:
  - Inverse kinematics of a 2dof planar arm.
-   - Number of Parameters: 2.
-   - Ref:https://github.com/jump-dev/DiffOpt.jl/blob/master/docs/src/examples/Planar_Arm_Example.jl
+   - Number of Parameter Variables: 2 (each is a scalar).
+   - Parameters Interpretation: End-Point Target.
+   - Ref:https://github.com/jump-dev/DiffOpt.jl/blob/master/docs/src/examples/Planar_Arm_Example.jl
+ - AC-OPF IEEE 300 Bus case.
+   - Number of Parameter Variables: 1 (vector).
+   - Parameters Interpretation: Multiplicative Factor Loads.
+   - Ref:
+     - PowerModels: https://github.com/lanl-ansi/PowerModels.jl
+     - PGLib: https://github.com/power-grid-lib/pglib-opf