From fc7ff342de909ebd8eaad7609ea49c333ad94416 Mon Sep 17 00:00:00 2001
From: Nao Pross <np@0hm.ch>
Date: Tue, 5 Mar 2024 00:47:31 +0100
Subject: Improve docstring

---
 mdpoly/abc.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mdpoly/abc.py b/mdpoly/abc.py
index 6ec1712..c503029 100644
--- a/mdpoly/abc.py
+++ b/mdpoly/abc.py
@@ -23,7 +23,10 @@ class Expr(Protocol):
     @property
     @abstractmethod
     def shape(self) -> Shape:
-        """ Computes the shape of the expression. """
+        """ Computes the shape of the expression. This method is also used to
+        check if the operation described by *Expr* can be perfomed with *left*
+        and *right*. If the shape cannot be computed because of an algebraic
+        problem raises :py:class:`mdpoly.errors.AlgebraicError`. """
 
     def __repr__(self):
         name = self.__class__.__qualname__
-- 
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