diff --git a/python/setup.cfg b/python/setup.cfg
index a19029d538..c9b9445af9 100644
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -78,9 +78,10 @@ good-names=i,
            k,
            ex,
            Run,
-           _,
-           fd,
-           c,
+           _,   # By convention: Unused variable
+           fh,  # fh = open(...)
+           fd,  # fd = os.open(...)
+           c,   # for c in string: ...
 
 [pylint.similarities]
 # Ignore imports when computing similarities.