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+dedent option
+-------------
+
+.. code-block::
+
+   First line
+   Second line
+       Third line
+   Fourth line
+
+ReST has no fixed indent and only a change in indentation is significant not the amount [1]_.
+Thus, the following code inside the code block is not indent even it looks so with respect to the previous block.
+
+.. code-block::
+
+       First line
+       Second line
+           Third line
+       Fourth line
+
+Having an option "fixates" the indent to be 3 spaces, thus the code inside the code block is indented by 4 spaces.
+
+.. code-block::
+   :class: dummy
+
+       First line
+       Second line
+           Third line
+       Fourth line
+
+The code has 6 spaces indent, minus 4 spaces dedent should yield a 2 space indented code in the output.
+
+.. code-block::
+   :dedent: 4
+
+         First line
+         Second line
+             Third line
+         Fourth line
+
+Dedenting by zero, should not strip any spaces and be a no-op.
+
+.. note::
+   This can be used as an alternative to ``:class: dummy`` above, to fixate the ReST indentation of the block.
+
+.. code-block::
+   :dedent: 0
+
+       First line
+       Second line
+           Third line
+       Fourth line
+
+Dedent without argument should autostrip common whitespace at the beginning.
+
+.. code-block::
+   :dedent:
+
+       First line
+       Second line
+           Third line
+       Fourth line
+
+.. [1] https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#indentation