diff --git a/slo.md b/slo.md
index 59bd8a7d6..7a154aa12 100644
--- a/slo.md
+++ b/slo.md
@@ -2,7 +2,7 @@
 
 - [[pull]] [[service level objective]]
 - e.g. a service will be available 99.999% of the time.
-  - 'available' might mean 'at all' or 'responding to critical requests within 2 seconds'. 
+  - 'available' might mean 'usable at all' or 'responding to critical requests within 2 seconds'. 
 
 
 [//begin]: # "Autogenerated link references for markdown compatibility"