diff --git a/core/declarations.gms b/core/declarations.gms
index 99fa4ac30d..b0cc9d022a 100644
--- a/core/declarations.gms
+++ b/core/declarations.gms
@@ -196,7 +196,7 @@ q_emiGHG_exclLULUCF_exclBunkers(ttot,all_regi)       "calculate total GHG emissi
 parameters
 
 *** general technoeconomic parameters
-pm_eta_conv(tall,all_regi,all_te)                    "conversion efficiency of all energy technologies, only applying to technologies that do not have explicit time-dependant conversion efficiencies, still eta converges until 2050 to dataglob_values. [efficiency (0..1)]"
+pm_eta_conv(tall,all_regi,all_te)                    "conversion efficiency of all energy technologies, only applying to technologies that do not have explicit time-dependant conversion efficiencies, still eta converges until 2050 to dataglob_values. [efficiency (0..1), nuclear: TWa_elec/Mt_Ur]"
 pm_dataeta(tall,all_regi,all_te)                     "read-in parameter for conversion efficiency of technologies that vary exogenously over time based on generisdata_varying_eta.prn file [efficiency (0..1)]"
 pm_data(all_regi,char,all_te)                        "Large array for most technical parameters of technologies, more detail on the individual technical parameters and their units can be found in the declaration of the set 'char' "
 pm_cf(tall,all_regi,all_te)                          "read-in parameter for capacity factor (fraction of the year that a plant is running) [share]"
@@ -334,7 +334,7 @@ $endif.scaleDemandIndTable
 pm_FEPrice(ttot,all_regi,all_enty,sector,emiMkt)     "parameter to capture all FE prices across sectors and markets [tr$2017/TWa]"
 pm_FEPrice_iter(iteration,ttot,all_regi,all_enty,sector,emiMkt) "parameter to capture all FE prices across sectors and markets [tr$2017/TWa] across iterations"
 pm_SEPrice(ttot,all_regi,all_enty)                   "parameter to capture all SE prices [tr$2017/TWa]"
-pm_PEPrice(ttot,all_regi,all_enty)                   "parameter to capture all PE prices [tr$2017/TWa]"
+pm_PEPrice(ttot,all_regi,all_enty)                   "parameter to capture all PE prices [tr$2017/TWa, Uranium: tr$2017/Mt_Ur]"
 
 p_FEPrice_by_SE_Sector_EmiMkt(ttot,all_regi,entySe,all_enty,sector,emiMkt) "parameter to save FE price per SE, sector and emission market [tr$2017/TWa]"
 p_FEPrice_by_Sector_EmiMkt(ttot,all_regi,all_enty,sector,emiMkt) "parameter to save FE marginal price per sector and emission market [tr$2017/TWa]"
diff --git a/modules/31_fossil/grades2poly/declarations.gms b/modules/31_fossil/grades2poly/declarations.gms
index 9e732d4a13..a17b8e44b0 100644
--- a/modules/31_fossil/grades2poly/declarations.gms
+++ b/modules/31_fossil/grades2poly/declarations.gms
@@ -23,13 +23,13 @@ p31_rentdisc(all_enty)                            "discount factor for the rent,
 p31_rentdisc2(all_enty)                           "discount factor for the rent achieved in 2100, used for the sensitivity analysis"
 p31_rentconv(all_enty)                            "number of year that the convergence to rentdisc2 takes"
 p31_rentdisctot(ttot, all_enty)                   "rent discount factor applied to the model"
-p31_fuExtrCumMaxBound(all_regi,all_enty,rlf)      "value of regional uranium extraction bound"
+p31_fuExtrCumMaxBound(all_regi,all_enty,rlf)      "value of regional uranium extraction bound [Mt_Ur]"
 ;
 
 positive variables
-v31_fuExtrCum(ttot,all_regi,all_enty,rlf)        "cumulated extraction of exhaustible resources [Mt]"
-v31_fuExtrCumMax(all_regi,all_enty,rlf)          "maximum of cumulated extraction of exhaustible resources [Mt]"
-v31_fuExtrMC(all_enty,rlf)                       "MC exhaustible resources [Mt]"
+v31_fuExtrCum(ttot,all_regi,all_enty,rlf)        "cumulated extraction of exhaustible resources [TWa, Uranium: Mt_Ur]"
+v31_fuExtrCumMax(all_regi,all_enty,rlf)          "maximum of cumulated extraction of exhaustible resources [Mt_Ur]"
+v31_fuExtrMC(all_enty,rlf)                       "MC exhaustible uranium resources [T$/Mt_Ur]"
 ;
 
 variables
diff --git a/modules/31_fossil/timeDepGrades/declarations.gms b/modules/31_fossil/timeDepGrades/declarations.gms
index 98c489f25d..5aa35d27c6 100644
--- a/modules/31_fossil/timeDepGrades/declarations.gms
+++ b/modules/31_fossil/timeDepGrades/declarations.gms
@@ -89,9 +89,9 @@ $ENDIF.mofex
 *-------------------------------------------
 positive variables
 *** Others
-v31_fuExtrCum(ttot,all_regi,all_enty,rlf)           "cumulated extraction of exhaustible resources"
-v31_fuExtrCumMax(all_regi,all_enty,rlf)             "maximum of cumulated extraction of exhaustible resources"
-v31_fuExtrMC(all_enty,rlf)                          "MC exhaustible resources"
+v31_fuExtrCum(ttot,all_regi,all_enty,rlf)           "cumulated extraction of exhaustible resources [TWa, Uranium: Mt_Ur]"
+v31_fuExtrCumMax(all_regi,all_enty,rlf)             "maximum of cumulated extraction of exhaustible resources [Mt_Ur]"
+v31_fuExtrMC(all_enty,rlf)                          "MC exhaustible uranium resources [T$/Mt_Ur]"
 v31_fuSlack(ttot,all_regi,all_enty,rlf)             "Amount of oil that is not extracted but put aside never to be used again. Unit: TWa/a"
 ;