diff --git a/doc/reference/python/green/block.rst b/doc/reference/python/green/block.rst
index e6435551..00945426 100644
--- a/doc/reference/python/green/block.rst
+++ b/doc/reference/python/green/block.rst
@@ -183,7 +183,7 @@ behaves like
 
 .. math::
 
-  g(z) \sim ... + M_{-1} z + M_0 + \frac{M_1}{z} + \frac{M_2}{z} + ...
+  g(z) \sim ... + M_{-1} z + M_0 + \frac{M_1}{z} + \frac{M_2}{z^2} + ...
 
 where :math:`M_i` are matrices with the same dimensions as :math:`g`.