diff --git a/src/nix/shell.md b/src/nix/shell.md
index 2a379e03f..90b81fb2f 100644
--- a/src/nix/shell.md
+++ b/src/nix/shell.md
@@ -41,8 +41,8 @@ R""(
 
 # Description
 
-`nix shell` runs a command in an environment in which the `$PATH`
-variable provides the specified *installables*. If not command is
-specified, it starts the default shell of your user account.
+`nix shell` runs a command in an environment in which the `$PATH` variable
+provides the specified *installables*. If no command is specified, it starts the
+default shell of your user account specified by `$SHELL`.
 
 )""