diff --git a/docs/source/advanced/kit/hpc/software/index.rst b/docs/source/advanced/kit/hpc/software/index.rst
index 2ec80c8fc..1ae8bb3dd 100644
--- a/docs/source/advanced/kit/hpc/software/index.rst
+++ b/docs/source/advanced/kit/hpc/software/index.rst
@@ -10,4 +10,4 @@ Refer to the following pages for product specific details and known issues.
    pe_rte.rst
    pe_de.rst
    essl.rst
-   pessl.rst 
+   pessl.rst