diff --git a/docs/CommandGuide/FileCheck.rst b/docs/CommandGuide/FileCheck.rst
index d76ad4dc75a..bf8147abf0a 100644
--- a/docs/CommandGuide/FileCheck.rst
+++ b/docs/CommandGuide/FileCheck.rst
@@ -69,7 +69,7 @@ and from the command line.
  This option controls the behavior when using more than one prefix as specified
  by :option:`--check-prefix` or :option:`--check-prefixes`, and some of these
  prefixes are missing in the test file. If true, this is allowed, if false,
- FileCheck will report error, listing the missing prefixes.
+ FileCheck will report an error, listing the missing prefixes.
 
  It is currently, temporarily, true by default, and will be subsequently
  switched to false.