diff --git a/_episodes/04-built-in.md b/_episodes/04-built-in.md
index 598da3c..1683b0e 100644
--- a/_episodes/04-built-in.md
+++ b/_episodes/04-built-in.md
@@ -135,7 +135,7 @@ round(...)
 ~~~
 {: .output}
 
-## Python reports a syntax error when grammar rules have been violated.
+## Python reports a syntax error when grammar rules (that's Python grammar not English grammar) have been violated.
 
 *   You've seen errors when you try to use a function incorrectly.
     * Can also have errors when you use punctuation incorrectly.