diff --git a/docs/source/algorithms/PoldiDataAnalysis-v1.rst b/docs/source/algorithms/PoldiDataAnalysis-v1.rst
index 7255020fb3706dc0314d652b1836e34eb48afc10..2ba86f8a52a3dd948256c1a25f170e46f6d52cbb 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 = {:.5} +/- {}".format(cell_a, cell_a_error))
+    print("Refined lattice parameter a = {:.5f} +/- {}".format(cell_a, cell_a_error))
 
 This will print the following output: