diff --git a/doc/reference/interaction.rst b/doc/reference/interaction.rst
index e4678969..f0e47b4a 100644
--- a/doc/reference/interaction.rst
+++ b/doc/reference/interaction.rst
@@ -153,13 +153,15 @@ The suppored formats are
 
 - **NumPy .npy format (binary file)**: Four dimensional NumPy array corresponding to :math:`U^{i}_{\alpha \beta \gamma \delta}` for shell :math:`i` is save by ``numpy.save`` command.
 
-- **text file**: :math:`U^{i}_{\alpha \beta \gamma \delta}` for each shell :math:`i` is written in a one dimansional manner as follows
+- **text file**: :math:`U^{i}_{\alpha \beta \gamma \delta}` for each shell :math:`i` is written in a one dimansional manner as follows (example for ``norb=3`` without spin-orbit coupling)
 
   ::
 
       Re(U[0,0,0,0])
       Re(U[0,0,0,1])
       Re(U[0,0,0,2])
+      Re(U[0,0,1,0])
+      ...
 
   or
 
@@ -168,10 +170,12 @@ The suppored formats are
       Re(U[0,0,0,0]) Im(U[0,0,0,0])
       Re(U[0,0,0,1]) Im(U[0,0,0,1])
       Re(U[0,0,0,2]) Im(U[0,0,0,2])
+      Re(U[0,0,1,0]) Im(U[0,0,1,0])
+      ...
 
-  No space should be put between different blocks. Lines beginning with `#` are skipped.
+  No blank line should be put between consecutive elements. Lines beginning with `#` are skipped.
 
-The definition of U tensor depends on the ``spin_orbit`` parameter.
+The definition of the U tensor depends on the ``spin_orbit`` parameter.
 For ``spin_orbit=False``, :math:`U^{i}_{\alpha \beta \gamma \delta}` is defined by Eq. :eq:`H_int`. The shape of the U tensor is ``(norb, norb, norb, norb)``.
 
 For ``spin_orbit=True``, on the other hand, :math:`U^{i}_{\alpha \beta \gamma \delta}` is defined by
diff --git a/src/dcore/interaction.py b/src/dcore/interaction.py
index e021ff74..c340c822 100644
--- a/src/dcore/interaction.py
+++ b/src/dcore/interaction.py
@@ -427,7 +427,7 @@ def _generate_umat_file(p: Dict):
                     # float (norb^4, 2) -> complex (norb^4, 1) -> complex (norb,norb,norb,norb)
                     umat = umat_1d.view(complex).reshape(u_shape)
                 else:
-                    raise Exception(f"inconsisten shape: require {(numpy.prod(u_shape),)} for real U or {(numpy.prod(u_shape), 2)} for complex U, but {umat_1d.shape} is given.")
+                    raise Exception(f"inconsistent shape: require {(numpy.prod(u_shape),)} for real U or {(numpy.prod(u_shape), 2)} for complex U, but {umat_1d.shape} is given.")
         except Exception as e:
             print(f"\nError in reading file '{file}' for ish={ish}", file=sys.stderr)
             print(e, file=sys.stderr)