diff --git a/nselib/formulas.lua b/nselib/formulas.lua
index 25f3c9c54..b2f6511dd 100644
--- a/nselib/formulas.lua
+++ b/nselib/formulas.lua
@@ -126,7 +126,7 @@ function looksRandom(data)
     return true
 end
 
--- Return the mean and sample standard deviation of an array, using the
+--- Return the mean and sample standard deviation of an array, using the
 -- algorithm from Knuth Vol. 2, Section 4.2.2.
 --
 -- @params t An array-style table of values