diff --git a/scripts/bench-spec-ab.py b/scripts/bench-spec-ab.py
index cf2ae9c..d2d9862 100755
--- a/scripts/bench-spec-ab.py
+++ b/scripts/bench-spec-ab.py
@@ -96,6 +96,8 @@ def log(msg, logfile):
 
 def sh(cmd):
     return subprocess.run(cmd, shell=True, capture_output=True, text=True).stdout.strip()
+
+
 def parse_configs(spec):
     """`name=SPEC_TYPE[@n_max][|KEY=VALUE]...`, entries joined by ';'.