diff --git a/io/io/src/TFile.cxx b/io/io/src/TFile.cxx
index 7e0a2000fbb00..52e6273208e63 100644
--- a/io/io/src/TFile.cxx
+++ b/io/io/src/TFile.cxx
@@ -9,67 +9,16 @@
  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
  *************************************************************************/
 
-/**
-  \defgroup IO Input/Output Library
-
-  The library collecting the ROOT classes dedicated to data input and output.
-
-  The detailed internal description of the \ref rootio is available.
-*/
-
 /**
 \file TFile.cxx
 \class TFile
 \ingroup IO
 
-A ROOT file is a suite of consecutive data records (TKey instances) with
-a well defined format.
-
-If the key is located past the 32 bit file limit (> 2 GB) then some fields will
-be 8 instead of 4 bytes:
-
-Byte Range      | Member Name | Description
-----------------|-----------|--------------
-1->4            | Nbytes    | Length of compressed object (in bytes)
-5->6            | Version   | TKey version identifier
-7->10           | ObjLen    | Length of uncompressed object
-11->14          | Datime    | Date and time when object was written to file
-15->16          | KeyLen    | Length of the key structure (in bytes)
-17->18          | Cycle     | Cycle of key
-19->22 [19->26] | SeekKey   | Pointer to record itself (consistency check)
-23->26 [27->34] | SeekPdir  | Pointer to directory header
-27->27 [35->35] | lname     | Number of bytes in the class name
-28->.. [36->..] | ClassName | Object Class Name
-..->..          | lname     | Number of bytes in the object name
-..->..          | Name      | lName bytes with the name of the object
-..->..          | lTitle    | Number of bytes in the object title
-..->..          | Title     | Title of the object
------>          | DATA      | Data bytes associated to the object
-
-The first data record starts at byte fBEGIN (currently set to kBEGIN).
-Bytes 1->kBEGIN contain the file description, when fVersion >= 1000000
-it is a large file (> 2 GB) and the offsets will be 8 bytes long and
-fUnits will be set to 8:
-Byte Range      | Record Name | Description
-----------------|-------------|------------
-1->4            | "root"      | Root file identifier
-5->8            | fVersion    | File format version
-9->12           | fBEGIN      | Pointer to first data record
-13->16 [13->20] | fEND        | Pointer to first free word at the EOF
-17->20 [21->28] | fSeekFree   | Pointer to FREE data record
-21->24 [29->32] | fNbytesFree | Number of bytes in FREE data record
-25->28 [33->36] | nfree       | Number of free data records
-29->32 [37->40] | fNbytesName | Number of bytes in TNamed at creation time
-33->33 [41->41] | fUnits      | Number of bytes for file pointers
-34->37 [42->45] | fCompress   | Compression level and algorithm
-38->41 [46->53] | fSeekInfo   | Pointer to TStreamerInfo record
-42->45 [54->57] | fNbytesInfo | Number of bytes in TStreamerInfo record
-46->63 [58->75] | fUUID       | Universal Unique ID
-
-Begin_Macro
-../../../tutorials/io/file.C
-End_Macro
-The structure of a directory is shown in TDirectoryFile::TDirectoryFile
+A ROOT file is a file-system file storing objects, possibly inside directories.
+TFile's base class' TDirectoryFile shows the structure of the TFile content.
+
+ \sa \ref IO
+ \sa \ref rootio
 */
 
 #include <ROOT/RConfig.hxx>