diff --git a/docs/src/Collections.md b/docs/src/Collections.md
index 88ebfff..6902ab7 100644
--- a/docs/src/Collections.md
+++ b/docs/src/Collections.md
@@ -18,7 +18,6 @@ EquationOfState
 │  ├─ PoirierTarantola3rd
 │  └─ PoirierTarantola4th
 ├─ Murnaghan
-├─ PolynomialEquationOfState
 └─ Vinet
 ```