Adds period

docs/algorithms.rst

@@ -202,7 +202,7 @@ Consider now the :math:`r`-partitions of the integer :math:`n`, there are :math:
 
 .. tip::
 
-   *Implemented as* :func:`thewalrus.low_rank_hafnian`. This function takes as argument the matrix :math:`\bm{G} \in \mathbb{C}^{n \times r}` and returns the value of the hafnian of the matrix :math:`\bm{A} = \bm{G} \bm{G}^T`
+   *Implemented as* :func:`thewalrus.low_rank_hafnian`. This function takes as argument the matrix :math:`\bm{G} \in \mathbb{C}^{n \times r}` and returns the value of the hafnian of the matrix :math:`\bm{A} = \bm{G} \bm{G}^T`.
 
 Sparse and banded algorithms
 ----------------------------