diff --git a/README.md b/README.md
index 4be0ed1..566b4cc 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ __BSM physics [🗂️](https://heplean.github.io/HepLean/docs/HepLean/BeyondThe
 
 __Flavor physics [🗂️](https://heplean.github.io/HepLean/docs/HepLean/FlavorPhysics/CKMMatrix/Basic.html):__ Properties of the CKM matrix.
 
-__Perturbation Theory [🗂️](https://heplean.github.io/HepLean/docs/HepLean/PerturbationTheory/Wick/Species.html)[🚧](https://heplean.github.io/HepLean/InformalGraph.html):__ Informal statements relating to Feynman diagrams, Wick contractions, Operator
+__Perturbation Theory [🗂️](https://heplean.github.io/HepLean/docs/HepLean/PerturbationTheory/Wick/Species.html) [🚧](https://heplean.github.io/HepLean/InformalGraph.html):__ Informal statements relating to Feynman diagrams, Wick contractions, Operator
 algebras.
 
 ## Associated media and publications