diff --git a/README-IT.md b/README-IT.md
index 861767d..b20225d 100644
--- a/README-IT.md
+++ b/README-IT.md
@@ -75,3 +75,7 @@ Alcuni nomi comuni degli oggetti sono presi da sorgenti internet come Wikipedia.
 
 La cartella 'addendum' contiene un file di catalogo separato che lista una serie di oggetti interessanti
 per gli astrofili, ma che non sono parte dei cataloghi NGC o IC.
+
+Nota che due oggetti Messier (M40 e M45) non hanno nessuna designazione NGC o IC e perciò sono
+presenti solo nell'addendum.
+
diff --git a/README.md b/README.md
index 7e4da08..91d97b1 100644
--- a/README.md
+++ b/README.md
@@ -75,6 +75,9 @@ Some common names are taken from internet sources like Wikipedia.
 The 'addendum' folder contains a separate catalog file with notably objects that are not
 part of the NGC or IC catalog. These objects may be of some interest to amateur astronomers.
 
+Note that two Messier objects (M40 and M45) haven't got any NGC or IC designation, so  they're
+listed only in the addendum.
+
 ### PYTHON INTERFACE
 
 For a basic Python interface to OpenNGC data, see PyOngc project at https://github.com/mattiaverga/PyOngc.
diff --git a/addendum/addendum.csv b/addendum/addendum.csv
index 3802b18..5a653c1 100644
--- a/addendum/addendum.csv
+++ b/addendum/addendum.csv
@@ -2,7 +2,7 @@ Name;Type;RA;Dec;Const;MajAx;MinAx;PosAng;B-Mag;V-Mag;J-Mag;H-Mag;K-Mag;SurfBr;H
 B33;DrkN;05:40:59.0;-02:27:30;Ori;6.00;4.00;90;;;;;;;;;;;;;;;;Horsehead Nebula;;Coordinates and diameters taken from Simbad.
 C9;HII;22:57:54.0;+62:31:06;Cep;50.00;30.00;;;;;;;;;;;;;;;;LBN 529,SH 2-155;Cave Nebula;;Coordinates taken from Simbad.
 C14;*Ass;02:20:42.0;+57:08:15;Per;50.00;50.00;;;;;;;;;;;;;;;;;Double Cluster, h & chi Persei;;Coordinates and dimensions inferred by author.
-C41;OCl;04:26:54.0;+15:52:00;Tau;;;;;;;;;;;;;;;;;;Mel 25;Hyades;;Coordinates taken from Simbad.
+C41;OCl;04:26:54.0;+15:52:00;Tau;329.00;;;;;;;;;;;;;;;;;Mel 25;Hyades;;Coordinates taken from Simbad, diameter taken from HEASARC's lyngaclust table
 C99;DrkN;12:31:19.0;-63:44:36;Cru;;;;;;;;;;;;;;;;;;;Coalsack Nebula;;Coordinates taken from Simbad.
 Cl399;*Ass;19:25:24.0;+20:11:00;Vul;70.00;;;3.93;3.60;;;;;;;;;;;;;;Brocchi's Cluster, Al Sufi's Cluster, Coathanger Asterism;;Diameter inferred by the author.
 ESO56-115;G;05:23:34.5;-69:45:22;Dor;646.00;550.00;170;0.80;0.40;;;;23.45;SBm;;;;;;;;ESO-LV 0561150,IRAS 05240-6948,PGC 017223;Large Magellanic Cloud,Nubecula Major;;BMag taken from LEDA.
@@ -12,10 +12,10 @@ H20;OCl;19:53:06.0;+18:20:00;Sge;5.10;;;8.40;7.70;;;;;;;;;;;;;MWSC 3198;;;Coordi
 H21;OCl;23:54:13.2;+61:44:24;Cas;1.80;;;;9.00;;;;;;;;;;;;;MWSC 3774;;;Coordinates taken from Simbad.
 HCG79;GGroup;15:59:11.9;+20:45:31;Ser;2.80;;;;;;;;;;;;;;;;;IRAS 15570+2053;Seyfert's Sextet;;Diameter inferred by the author.
 HCG92;GGroup;22:35:59.0;+33:57:30;Peg;4.40;;;;;;;;;;;;;;;;;IRAS 22337+3342;Stephan's Quintet;Contains the GPair NGC 7318.;Diameter inferred by the author.
-M40;**;12:22:16.1;+58:05:04;UMa;;;;0.50;;;;;;;;;;040;;;;WDS J12222+5805AB;;;BMag taken from NED.
-Mel22;OCl;03:47:28.6;+24:06:19;Tau;150.00;150.00;90;;;;;;;;;;;045;;;;MWSC 0305;Pleiades;;Coordinates taken from Simbad.
+M40;**;12:22:16.1;+58:05:04;UMa;;;;;8.00;;;;;;;;;040;;;;WDS J12222+5805AB;;;VMag taken from HEASARC's messier table
+Mel22;OCl;03:47:28.6;+24:06:19;Tau;150.00;150.00;90;;1.20;;;;;;;;;045;;;;MWSC 0305;Pleiades;;Coordinates taken from Simbad, VMag taken from HEASARC's messier table
 Mel71;OCl;07:37:33.6;-12:03:18;Pup;14.40;;;7.44;7.10;;;;;;;;;;;;;MWSC 1287;;;Coordinates taken from Simbad.
 Mel72;OCl;07:28:38.8;-10:42:00;Pup;7.50;;;;10.10;;;;;;;;;;;;;;;;Coordinates taken from Simbad.
 Mel101;OCl;10:42:12.0;-65:06:00;Car;8.40;;;8.50;8.00;;;;;;;;;;;;;MWSC 1840;;;Coordinates taken from Simbad.
 Mel105;OCl;11:19:42.0;-63:29:00;Car;5.40;;;9.05;8.50;;;;;;;;;;;;;MWSC 1933;;;Coordinates taken from Simbad.
-Mel111;OCl;12:25:06.0;+26:06:00;Com;;;;;;;;;;;;;;;;;;;Coma Star Cluster;;Coordinates taken from Simbad.
+Mel111;OCl;12:25:06.0;+26:06:00;Com;253.50;;;;;;;;;;;;;;;;;;Coma Star Cluster;;Coordinates taken from Simbad, diameter taken from MWSC.
diff --git a/addendum/addendum.ods b/addendum/addendum.ods
index 8d021e2..331a278 100644
Binary files a/addendum/addendum.ods and b/addendum/addendum.ods differ