diff --git a/README.md b/README.md
index 1e48076..ca28549 100644
--- a/README.md
+++ b/README.md
@@ -39,13 +39,13 @@ feature you are missing, you can have a look
 ## Changelog
 ### Unreleased
 * Add --ignore-deletethreshold (by exterrestris, #25)
-* Add support for scrub --plan, replacing --percentage
+* Add support for scrub --plan, replacing --percentage (thanks to fmoledina)
 * Remove snapraid progress output. Was accidentially introduced with python3
   support.
 
 ### v0.5 (26 Feb 2021)
 * Remove (broken) python2 support
-* Fix snapraid output encoding handling  (by hyyz17200, #31)
+* Fix snapraid output encoding handling (by hyyz17200, #31)
 * Fix log rotation (by ptoulouse, #36)
 
 ### v0.4 (17 Aug 2019)
diff --git a/snapraid-runner.conf.example b/snapraid-runner.conf.example
index 14f2e20..bc8fca4 100644
--- a/snapraid-runner.conf.example
+++ b/snapraid-runner.conf.example
@@ -40,4 +40,5 @@ password =
 enabled = false
 ; scrub plan - either a percentage or one of [bad, new, full]
 plan = 12
+; minimum block age (in days) for scrubbing. Only used with percentage plans
 older-than = 10
diff --git a/snapraid-runner.py b/snapraid-runner.py
index e45b2fa..56b8e9e 100644
--- a/snapraid-runner.py
+++ b/snapraid-runner.py
@@ -291,10 +291,17 @@ def run():
     if config["scrub"]["enabled"]:
         logging.info("Running scrub...")
         try:
-            snapraid_command("scrub", {
+            # Check if a percentage plan was given
+            int(config["scrub"]["plan"])
+        except ValueError:
+            scrub_args = {"plan": config["scrub"]["plan"]}
+        else:
+            scrub_args = {
                 "plan": config["scrub"]["plan"],
                 "older-than": config["scrub"]["older-than"],
-            })
+            }
+        try:
+            snapraid_command("scrub", scrub_args)
         except subprocess.CalledProcessError as e:
             logging.error(e)
             finish(False)