diff --git a/lib/sidekiq/redis_connection.rb b/lib/sidekiq/redis_connection.rb
index 85baf990..400f8b81 100644
--- a/lib/sidekiq/redis_connection.rb
+++ b/lib/sidekiq/redis_connection.rb
@@ -38,7 +38,7 @@ module Sidekiq
       #   - enterprise's leader election
       #   - enterprise's cron support
       def verify_sizing(size, concurrency)
-        raise ArgumentError, "Your Redis connection pool is too small for Sidekiq to work. Your pool has #{size} connections but really needs to have at least #{concurrency + 2}" if size <= concurrency
+        raise ArgumentError, "Your Redis connection pool is too small for Sidekiq to work. Your pool has #{size} connections but must have at least #{concurrency + 2}" if size <= concurrency
       end
 
       def build_client(options)