diff --git a/system/parallel/slack-desc b/system/parallel/slack-desc
index 6d0571e095..32663235a5 100644
--- a/system/parallel/slack-desc
+++ b/system/parallel/slack-desc
@@ -6,7 +6,7 @@
 # customary to leave one space after the ':' except on otherwise blank lines.
 
         |-----handy-ruler------------------------------------------------------|
-parallel: parallell (Executes jobs in parallel)
+parallel: parallel (Executes jobs in parallel)
 parallel:
 parallel: GNU parallel is a shell tool for executing jobs in parallel using one
 parallel: or more computers. A job can be a single command or a small script