diff --git a/src/nix/path-info.cc b/src/nix/path-info.cc
index 076e4e2c191..ce7b0f34cfe 100644
--- a/src/nix/path-info.cc
+++ b/src/nix/path-info.cc
@@ -50,8 +50,8 @@ struct CmdPathInfo : StorePathsCommand, MixJSON
         addFlag({
             .longName = "query-substitutes",
             .description =
-                "Query path availability in the configured substituters, printing only those that are not available."
-                "with `--json` adds a `substitutable` boolean to the output.",
+                "Query path availability in the configured substituters, printing only those that are not available. "
+                "When used with `--json`, a `substitutable` boolean is added to the output.",
             .handler = {&showSubStatus, true},
         });
     }