diff --git a/docs/source/algorithms/PoldiDataAnalysis-v1.rst b/docs/source/algorithms/PoldiDataAnalysis-v1.rst
index f11884664eabb42b622a585efd9679a62d06a5d9..7255020fb3706dc0314d652b1836e34eb48afc10 100644
--- a/docs/source/algorithms/PoldiDataAnalysis-v1.rst
+++ b/docs/source/algorithms/PoldiDataAnalysis-v1.rst
@@ -61,7 +61,7 @@ The algorithm requires relatively little input and can be run like this:
     cell_a = np.round(cell.cell(0, 1), 5)
     cell_a_error = np.round(cell.cell(0, 2), 5)
 
-    print("Refined lattice parameter a = {} +/- {}".format(cell_a, cell_a_error))
+    print("Refined lattice parameter a = {:.5} +/- {}".format(cell_a, cell_a_error))
 
 This will print the following output: