updated documentation comments
diff --git a/aos/config/setup_rt_caps.sh b/aos/config/setup_rt_caps.sh
index 11fb1f1..1ba4f65 100755
--- a/aos/config/setup_rt_caps.sh
+++ b/aos/config/setup_rt_caps.sh
@@ -1,5 +1,8 @@
 #!/bin/bash
-# has to be run as root
+
+# Sets capabilities on a binary so it can run as realtime code as a user who
+# doesn't have those rlimits or some other reason they can.
+# Has to be run as root.
 
 setcap 'CAP_IPC_LOCK+pie CAP_SYS_NICE+pie' $0