diff --git a/tutorials/cocoa/flower.C b/tutorials/cocoa/flower.C
index 352867cdde48ea101e48106fb3aebf7ef9baf1d8..64619f174092a7a3e65797bcfb35ea08c8392c49 100644
--- a/tutorials/cocoa/flower.C
+++ b/tutorials/cocoa/flower.C
@@ -1,7 +1,7 @@
 //Author: Timur Pocheptsov, 4/02/2014
 
-//Another demo to show transparency with TMultiGraph
-//(and the really interesting curve/equation). + point compression in
+//A demo to show transparency with TMultiGraph
+//(and a really interesting curve/equation). + point compression in
 //TPadPainter :))
 //You can see all three flowers ONLY with Cococa (transparency).
 
diff --git a/tutorials/cocoa/grad.C b/tutorials/cocoa/grad.C
index 71d4cc6962318d65a9a4f68a71f0606c832fb66d..3df513b20a5fa4eb73f178159150e26f1c0fd060 100644
--- a/tutorials/cocoa/grad.C
+++ b/tutorials/cocoa/grad.C
@@ -1,3 +1,4 @@
+//Author: Timur Pocheptsov, 25/09/2012 (?)
 //This macro shows how to create and use linear gradients to fill
 //a histogram or a pad.
 //Requires OS X and ROOT configured with --enable-cocoa.
diff --git a/tutorials/cocoa/grad2.C b/tutorials/cocoa/grad2.C
index 263fad695d5ab8a7f90671f767a1a8f987ec482c..be6467f7bd9af7835c6fd9f3610140f63f2bd099 100644
--- a/tutorials/cocoa/grad2.C
+++ b/tutorials/cocoa/grad2.C
@@ -1,3 +1,4 @@
+//Author: Timur Pocheptsov, 25/09/2012.
 //Gradient fill with transparency and "SAME" option.
 //Requires OS X and ROOT configured with --enable-cocoa.
 
diff --git a/tutorials/cocoa/parallelcoordtrans.C b/tutorials/cocoa/parallelcoordtrans.C
index d9a449562fa9292e4c3dc8998b4a27c66783a440..f812f8ecd6b146c46cf083b450d7a826a0ccbcc1 100644
--- a/tutorials/cocoa/parallelcoordtrans.C
+++ b/tutorials/cocoa/parallelcoordtrans.C
@@ -3,7 +3,7 @@
 // the second time with transparency. On the second plot, several clusters
 // appear.
 
-//Authors: Olivier Couet (original macro), adapted for TGCocoa by Timur Pocheptsov.
+//Authors: Olivier Couet (original macro), adapted for TGCocoa by Timur Pocheptsov (26/09/2012).
 
 
 //All these includes are (only) to make the macro
diff --git a/tutorials/cocoa/transp.C b/tutorials/cocoa/transp.C
index 94cf8cd6deb84e21d93ee73f7fe00bf9b3e86567..52a2890664af1f3f1349f72c5ee44890820abb26 100644
--- a/tutorials/cocoa/transp.C
+++ b/tutorials/cocoa/transp.C
@@ -1,3 +1,4 @@
+//Author: Timur Pocheptsov, 25/09/2012
 //This demo shows how to use transparency.
 //On MacOS X you can see the transparency in a canvas,
 //you can save canvas contents as pdf/png
diff --git a/tutorials/cocoa/transp_text.C b/tutorials/cocoa/transp_text.C
index 5c1d7c3da37d7b8eae95cd5a7fad3c35448bff2c..e2048cb5f599695e7d7af717ee90413121eca23c 100644
--- a/tutorials/cocoa/transp_text.C
+++ b/tutorials/cocoa/transp_text.C
@@ -1,5 +1,5 @@
 //This macro is based on labels1.C by Rene Brun.
-//Updated by Timur Pocheptsov to use transparent text.
+//Updated by Timur Pocheptsov to use transparent text (12/10/2012).
 //Requires OS X and ROOT configured with --enable-cocoa.
 
 
diff --git a/tutorials/cocoa/transparentpad.C b/tutorials/cocoa/transparentpad.C
index a586d27a337f40e5933435eee4d3c135f7d294b8..b0baf9a003e5f029b152d2bb929d5623408e24a7 100644
--- a/tutorials/cocoa/transparentpad.C
+++ b/tutorials/cocoa/transparentpad.C
@@ -1,3 +1,4 @@
+//Author: Timur Pocheptsov, 17/03/2014.
 //This macro demonstrates semi-transparent pads.
 //Requires OS X and ROOT configured with --enable-cocoa.