diff --git a/Release-notes.md b/Release-notes.md
index 7bdf7f5..836f919 100644
--- a/Release-notes.md
+++ b/Release-notes.md
@@ -21,6 +21,12 @@
   
 ### Enhancement
 
+- Some sequences in the Genbank and EMBL databases are several gigabases long. The 
+  sequence parser had to reallocate and recopy memory many times to read them, 
+  resulting in a complexity of O(N^2) for reading such large sequences. 
+  The new file chunk reader has a linear algorithm that speeds up the reading 
+  of very long sequences.
+
 - A new option **--csv** is added to every obitools to indicate that the input
   format is CSV
 
diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index bde6c12..6107b75 100644
--- a/pkg/obioptions/version.go
+++ b/pkg/obioptions/version.go
@@ -8,7 +8,7 @@ import (
 // corresponds to the last commit, and not the one when the file will be
 // commited
 
-var _Commit = "937a483"
+var _Commit = "3a1cf4f"
 var _Version = "Release 4.4.0"
 
 // Version returns the version of the obitools package.