diff --git a/docs/AnalyseGenomes_2024/histories_check.md b/docs/AnalyseGenomes_2024/histories_check.md
index a2cb7c00..5fc692e1 100644
--- a/docs/AnalyseGenomes_2024/histories_check.md
+++ b/docs/AnalyseGenomes_2024/histories_check.md
@@ -1,5 +1,46 @@
![](images/checkpoint.png){width="80"}
+We need to see that all the input datasets you need for next analyses in Galaxy
+are available in your account.
+Thus, you should have now downloaded 3 data sets in three distinct histories.
+
+- [x] Genomic references in an history `References`
+- [x] RNAseq datasets in an history `RNA sequence datasets` (or similar history name)
+- [x] small RNAseq datasets ub an history `Small RNAseq data` (or similar history name)
+
+Indeed, you can visualize these 3 histories side-by-side:
+
+Click on the upper-right icon in the history side bar (right handside of the
+Galaxy interface).
+
+Select the item `Show Histories Side-by-Side`
+
+![](images/side-by-side.png){width="300px"}
+
+This menu takes you to the "History multiview" feature. This view mode is
+convenient for various datasets managements, for instance for copying datasets
+between histories (just drag and drop the datasets over the histories)
+
+It is also handy to have a global view of your analyses in Galaxy (especially
+if you gave appropriate and meaningful names to theses histories).
+
+Thus, in the current mutiview, you should see your three dataset histories
+side-by-side.
+
+Please, be sure it is the case (if not explore the interface in order to display
+these three histories).
+
+Then, take a screenshot of these histories, similar to the following image.
+
+![](images/AG_input_data_histories.png){width="600px"}
+
+And please, paste your screenshot in the third GitHub
+[discussion](https://github.com/ARTbio/AnalyseGenome/discussions/42) in a
+separate comment (one by student).
+
+
+![](images/thanks.jpg){width="300px"}
+
---
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