diff --git a/RSIO.md b/RSIO.md
index b555225..5272741 100644
--- a/RSIO.md
+++ b/RSIO.md
@@ -22,7 +22,7 @@ local IO_PORT = {
     -- digital outputs --
 
     -- facility
-    F_ALARM       = 7,  -- active high, facility alarm (any high priority unit alarm)
+    F_ALARM       = 7,  -- active high, facility-wide alarm (any high priority unit alarm)
 
     -- waste
     WASTE_PU      = 8,  -- active low, waste -> plutonium -> pellets route