diff --git a/.en-custom.txt b/.en-custom.txt
index f3aa57807e..5c8371deb3 100644
--- a/.en-custom.txt
+++ b/.en-custom.txt
@@ -250,6 +250,7 @@ Péclet
 PEG-SPS-Cl
 Peric
 PETSc
+petsc4py
 photovoltaics
 PID
 pipelines.yml