diff --git a/src/nix-store/help.txt b/src/nix-store/help.txt
index bdd1b644b0..c4981168bd 100644
--- a/src/nix-store/help.txt
+++ b/src/nix-store/help.txt
@@ -4,7 +4,7 @@ Usage: nix-store [OPTIONS...] [ARGUMENTS...]
 
 Operations:
 
-  --realise / -r: ensure path validity; if a derivation, ensure that
+  --realise / -r: ensure path validity; if a derivation, ensure the
       validity of the outputs
   --add / -A: copy a path to the Nix store
   --delete: safely delete paths from the Nix store