diff --git a/tools/fan_rpm_loop_unittest.sh b/tools/fan_rpm_loop_unittest.sh
index 2700de1..d4a001e 100755
--- a/tools/fan_rpm_loop_unittest.sh
+++ b/tools/fan_rpm_loop_unittest.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 
 SourceModule() {
+  # shellcheck source=tools/fan_rpm_loop_test.sh
   . fan_rpm_loop_test.sh
 }