diff --git a/Command-line.md b/Command-line.md
index 98bf83b..57a5d9b 100644
--- a/Command-line.md
+++ b/Command-line.md
@@ -41,7 +41,7 @@ the quotes are optional.
 Wildcards consist of the `*` character at the beginning, end, or both and can substitute for
 any number of any characters (including none)
 
-If spec is prefixed with `exclude:` or the `~` character then the pattern matches an exclusion.
+If a spec is prefixed with `exclude:` or the `~` character then the pattern matches an exclusion.
 This means that tests matching the pattern are excluded from the set - even if a prior
 inclusion spec included them. Subsequent inclusion specs will take precendence, however.
 Inclusions and exclusions are evaluated in left-to-right order.