Update README.md

README.md

@@ -12,9 +12,9 @@ Use:
 >>> permanent(eye(15))
 (1-0j)
 ```
-Please note that the function assumes that the array contains complex numbers. So for example:
+Please note that for now we assume that the input array's `dtype` is `complex`. So for example:
 ```python
 >>> permanent(array([[0,1],[1,1]]), dtype=complex)
 (1+0j)
 ```
-whereas using ```permanent(array([[0,1],[1,1]]))``` will not produce the expected result.
+whereas ```permanent(array([[0,1],[1,1]]))``` will not produce the expected result.