diff --git a/control/sysnorm.py b/control/sysnorm.py
index 49873dbaf..f5e583dcf 100644
--- a/control/sysnorm.py
+++ b/control/sysnorm.py
@@ -94,13 +94,13 @@ def norm(system, p=2, tol=1e-6, print_warning=True, method=None):
Type of norm to be computed. ``p=2`` gives the H2 norm, and ``p='inf'`` gives the L-infinity norm.
tol : float
Relative tolerance for accuracy of L-infinity norm computation. Ignored
- unless p='inf'.
+ unless ``p='inf'``.
print_warning : bool
Print warning message in case norm value may be uncertain.
method : str, optional
Set the method used for computing the result. Current methods are
- 'slycot' and 'scipy'. If set to None (default), try 'slycot' first
- and then 'scipy'.
+ ``'slycot'`` and ``'scipy'``. If set to ``None`` (default), try ``'slycot'`` first
+ and then ``'scipy'``.
Returns
-------
@@ -114,10 +114,10 @@ def norm(system, p=2, tol=1e-6, print_warning=True, method=None):
Examples
--------
>>> Gc = ct.tf([1], [1, 2, 1])
- >>> ct.norm(Gc, 2)
- 0.5000000000000001
- >>> ct.norm(Gc, 'inf', tol=1e-11, method='scipy')
- 1.000000000007276
+ >>> round(ct.norm(Gc, 2), 3)
+ 0.5
+ >>> round(ct.norm(Gc, 'inf', tol=1e-5, method='scipy'), 3)
+ 1.0
"""
if not isinstance(system, (ct.StateSpace, ct.TransferFunction)):
diff --git a/doc/control.rst b/doc/control.rst
index 96714bf7d..1b1b74069 100644
--- a/doc/control.rst
+++ b/doc/control.rst
@@ -179,6 +179,7 @@ Utility functions and conversions
issys
mag2db
modal_form
+ norm
observable_form
pade
reachable_form
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