diff --git a/README.rst b/README.rst
index 1e4a5b8..185cab3 100644
--- a/README.rst
+++ b/README.rst
@@ -516,6 +516,15 @@ For the last one, this configuration is known to work:
 2. launch ``Xvfb :99 -screen 0 1x1x16 > /dev/null 2>&1 &`` (note: this use a very small x framebuffer 1x1 pixel in 16 color depth to limit video usage).
 3. run python code with env var ``DISPLAY=:99.0``
 
+Process Stuck during generation of big spreadsheet preview
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+With libreoffice version like 6.0.7.3, the generation of some big spreadsheet files (like xlsx) takes a very long time, until it reaches a 1 minute timeout.
+The solution is to update libreoffice.
+
+During our internal tests, we found out that the spreadsheet file that failed to be generated in 6.0.7.3 is properly generated in 6.4.2.2. We advise you to
+use at least this version to avoid this kind of issues.
+
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 Contribute and Developer’s Kit
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