diff --git a/apps/toolbox.nl.i18n b/apps/toolbox.nl.i18n
index 7cf219fbe..b73b1e76f 100644
--- a/apps/toolbox.nl.i18n
+++ b/apps/toolbox.nl.i18n
@@ -154,7 +154,7 @@ RandomAndApproximation = "Random en afronding"
 RandomFloat = "Decimaal getal in [0,1)"
 RandomInteger = "Random geheel getal in [a,b]"
 PrimeFactorDecomposition = "Ontbinden in factoren"
-NormCDF = "P(X<a) waar X volgt N(μ,)"
+NormCDF = "P(X<a) waar X volgt N(μ,σ)"
 NormCDF2 = "P(a<X<b) waar X volgt N(μ,σ)"
 InvNorm = "m waar P(X<m)=a, X volgt N(μ,σ)"
 NormPDF = "Kansdichtheid van N(μ,σ)"