diff --git a/CITATION.bib b/CITATION.bib
index 404ceab..a33e261 100644
--- a/CITATION.bib
+++ b/CITATION.bib
@@ -1,5 +1,6 @@
 @misc{quadgk,
   title = {{QuadGK.jl}: {G}auss--{K}ronrod integration in {J}ulia},
   author = {Steven G. Johnson},
+  year = {2013},
   howpublished = {\url{https://github.com/JuliaMath/QuadGK.jl}}
 }