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-rw-r--r--documentation/ref-manual/variables.rst5
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diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 30887f12cb..ec4d7ab73f 100644
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@@ -10247,6 +10247,11 @@ system and gives an overview of their function and contents.
10247 memory and become problematic with parallelism elsewhere in the build. 10247 memory and become problematic with parallelism elsewhere in the build.
10248 "50%" has been found to be a good value. 10248 "50%" has been found to be a good value.
10249 10249
10250 :term:`ZSTD_COMPRESSION_LEVEL`
10251 Specifies the compression level to be used with ZStandard compression
10252 (from ``1`` to ``19``, set to ``3`` by default, following upstream choice).
10253 Higher levels produce smaller files, but take longer to complete.
10254
10250 :term:`ZSTD_THREADS` 10255 :term:`ZSTD_THREADS`
10251 Specifies the number of parallel threads that should be used when 10256 Specifies the number of parallel threads that should be used when
10252 using ZStandard compression. 10257 using ZStandard compression.