diff --git a/docs/release_notes.md b/docs/release_notes.md
index 2f8d844..fd5cf08 100644
--- a/docs/release_notes.md
+++ b/docs/release_notes.md
@@ -5,7 +5,7 @@
 
 ### New Features and Major Changes
 
-* 
+* [Add quantities for time-variant quantities of DCNetworkBlock #91](https://github.com/SPSUnipi/pySMSpp/pull/91)
 
 ### Minor Changes and Bug Fixes
 
diff --git a/pysmspp/data/blocks/UCBlock.csv b/pysmspp/data/blocks/UCBlock.csv
index 625537a..8f62309 100644
--- a/pysmspp/data/blocks/UCBlock.csv
+++ b/pysmspp/data/blocks/UCBlock.csv
@@ -2,6 +2,7 @@ block_name,attribute,smspp_object,netcdf_component,netcdf_base_type,dimension,un
 UCBlock,block_type,Attribute,Attribute,str,-,-,,required,Type of the block
 UCBlock,id,Attribute,Attribute,str,-,-,,optional,Id of the block
 UCBlock,TimeHorizon,Dimension,Dimension,int,-,-,,required,Time horizon of the optimization problem
+UCBlock,NumberInstants,Dimension,Dimension,int,-,-,,required,Dimension of the time steps used to map time-dependent MaxPowerFlow MinPowerFlow and Efficiency of network assets 
 UCBlock,NumberUnits,Dimension,Dimension,int,-,-,,required,Number of units
 UCBlock,NumberElectricalGenerators,Dimension,Dimension,int,-,-,,optional,Number of electrical generators
 UCBlock,NumberNodes,Dimension,Dimension,int,-,-,1,optional,Number of nodes
@@ -16,11 +17,11 @@ UCBlock,LineName,Variable,Variable,str,NumberLines,str,,optional,Name of the lin
 UCBlock,GeneratorNode,Variable,Variable,int,-|NumberElectricalGenerators,-,,optional,List of buses of connection by unit
 UCBlock,StartLine,Variable,Variable,int,-|NumberLines|NumberBranches,-,,optional,Start buses of lines
 UCBlock,EndLine,Variable,Variable,int,-|NumberLines|NumberBranches,-,,optional,End buses of lines
-UCBlock,MinPowerFlow,Variable,Variable,double,-|NumberLines,MW,,optional,Minimum power flow of lines
-UCBlock,MaxPowerFlow,Variable,Variable,double,-|NumberLines,MW,,optional,Maximum power flow of lines
+UCBlock,MinPowerFlow,Variable,Variable,double,-|NumberLines|NumberLines-NumberInstants,MW,,optional,Minimum power flow of lines
+UCBlock,MaxPowerFlow,Variable,Variable,double,-|NumberLines|NumberLines-NumberInstants,MW,,optional,Maximum power flow of lines
 UCBlock,LineSusceptance,Variable,Variable,double,-|NumberLines,Siemens,,optional,Susceptance of lines
 UCBlock,LineResistance,Variable,Variable,double,-|NumberLines,Ohm,,optional,Resistance of lines
-UCBlock,Efficiency,Variable,Variable,double,-|NumberLines|NumberBranches,Ohm,,optional,Efficiency of lines or hyperarc branches; functional only for HVDC lines (default 1.0)
+UCBlock,Efficiency,Variable,Variable,double,-|NumberLines|NumberBranches|NumberLines-NumberInstants|NumberBranches-NumberInstants,Ohm,,optional,Efficiency of lines or hyperarc branches; functional only for HVDC lines (default 1.0)
 UCBlock,HyperArcID,Variable,Variable,double,-|NumberBranches,MW,,optional,Hyperarch ID of each branch: it is the line id corresponding to the branch being added
 UCBlock,NetworkCost,Variable,Variable,double,-|NumberLines,€/MWh,,optional,Marginal cost of the network flows
 UCBlock,ActivePowerDemand,Variable,Variable,double,-|NumberNodes|TimeHorizon|NumberNodes-TimeHorizon,MW,,optional,Active power demand of nodes