diff --git a/Release-notes.md b/Release-notes.md
index d91b1c6..d97a371 100644
--- a/Release-notes.md
+++ b/Release-notes.md
@@ -2,6 +2,40 @@
 
 ## Ongoing changes
 
+### New features
+
+- Adding of the function `contains` to the expression language for testing if a map contains a key.
+  It can be used from `obibrep` to select only sequences occurring in a given sample :
+
+  ```{bash}
+  obigrep -p 'contains(annotations.merged_sample,"15a_F730814")' wolf_new_tag.fasta
+  ```   
+- Adding of a new command `obipcrtag`. It tags raw Illumina reads with the identifier of their corresponding
+  sample. The tags added are the same as those added by `obimultiplex`. The produced forward and reverse files
+  can then be split into different files using the `obidistribute` command.
+
+  ```{bash}
+  obitagpcr -F library_R1.fastq \
+            -R library_R2.fastq \
+            -t sample_ngsfilter.txt \
+            --out tagged_library.fastq \
+            --unidentified not_assigned.fastq
+  ```
+
+  the command produced four files : `tagged_library_R1.fastq` and `tagged_library_R2.fastq` containing the assigned reads and `not_assigned_R1.fastq` and `not_assigned_R2.fastq` containing the unassignable reads.
+
+  the tagged library files can then be split using `obidistribute`: 
+
+  ```{bash}
+  mkdir pcr_reads
+  obidistribute --pattern "pcr_reads/sample_%s_R1.fastq" -c sample tagged_library_R1.fastq
+  obidistribute --pattern "pcr_reads/sample_%s_R2.fastq" -c sample tagged_library_R2.fastq
+  ```
+### Corrected bugs
+
+- Correction of a bug in memory management and Slice recycling.
+- Correction of the **--fragmented** option help and logging information
+
 ## March 31th, 2023. Release 4.0.2
 
 ### Compiler change
diff --git a/pkg/obitools/obipcr/options.go b/pkg/obitools/obipcr/options.go
index edf380d..5814ba1 100644
--- a/pkg/obitools/obipcr/options.go
+++ b/pkg/obitools/obipcr/options.go
@@ -33,7 +33,7 @@ func PCROptionSet(options *getoptions.GetOpt) {
 		options.Description("Considers that sequences are [c]ircular."))
 
 	options.BoolVar(&_Fragmented, "fragmented", false,
-		options.Description("Fragaments long sequences in overlaping fragments to speedup computations"))
+		options.Description("Fragments long sequences in overlaping fragments to speedup computations"))
 
 	options.StringVar(&_ForwardPrimer, "forward", "",
 		options.Required("You must provide a forward primer"),
diff --git a/pkg/obitools/obipcr/pcr.go b/pkg/obitools/obipcr/pcr.go
index 72ff109..2ec4288 100644
--- a/pkg/obitools/obipcr/pcr.go
+++ b/pkg/obitools/obipcr/pcr.go
@@ -49,7 +49,7 @@ func CLIPCR(iterator obiiter.IBioSequence) (obiiter.IBioSequence, error) {
 			obioptions.CLIParallelWorkers(),
 		)
 		log.Infof("Fragmenting sequence longer than %dbp into chuncks of %dbp",
-			CLIMaxLength()*100000000,
+			CLIMaxLength()*1000,
 			CLIMaxLength()*100,
 		)
 		iterator = iterator.Pipe(frags)