diff --git a/docs/language/cli.rst b/docs/language/cli.rst
index 28bd067..ae9b620 100644
--- a/docs/language/cli.rst
+++ b/docs/language/cli.rst
@@ -35,7 +35,7 @@ Command Line Options
 
 .. cmdoption:: --spy
 
-   Print equivalent Python code before executing. For example::
+   Print equivalent Python code before executing in REPL. For example::
 
     => (defn salutationsnm [name] (print (+ "Hy " name "!")))
     def salutationsnm(name):
@@ -45,6 +45,7 @@ Command Line Options
     Hy YourName!
     =>
 
+   `--spy` only works on REPL mode.
    .. versionadded:: 0.9.11
 
 .. cmdoption:: --show-tracebacks