diff --git a/declearn/communication/__init__.py b/declearn/communication/__init__.py
index 819f28e1ac409a4bbed79d2e21ca0b05404dc163..e7f685f248bfc22bbc35300a0ef3f39d66660dba 100644
--- a/declearn/communication/__init__.py
+++ b/declearn/communication/__init__.py
@@ -70,8 +70,10 @@ from ._build import (
 try:
     from . import grpc
 except ImportError:
+    # pragma: no cover
     _INSTALLABLE_BACKENDS["grpc"] = ("grpcio", "protobuf")
 try:
     from . import websockets
 except ImportError:
+    # pragma: no cover
     _INSTALLABLE_BACKENDS["websockets"] = ("websockets",)