mjo/eja/eja_operator.py: add a comment about something non-obvious

diff --git a/mjo/eja/eja_operator.py b/mjo/eja/eja_operator.py
index 4c1d60ddbf192f4b9fb2909e6934b1e96a559ba2..0b1e9a8a78d45e90bf28e2bb463868417fd834ad 100644 (file)
--- a/mjo/eja/eja_operator.py
+++ b/mjo/eja/eja_operator.py
@@ -631,7 +631,7 @@ class EJAOperator(Map):
         of Faraut & Koranyi::
 
             sage: J1 = HadamardEJA(1)
-            sage: J2 = HadamardEJA(1, prefix='c')
+            sage: J2 = HadamardEJA(1, prefix='c')  # ensures J2 is not J1
             sage: J2._inner_product_matrix = 2*J1._inner_product_matrix
             sage: J = cartesian_product([J1,J2])
             sage: M = matrix(J1.base_ring(), [[0,1],[1,0]])