diff --git a/yaml.html.markdown b/yaml.html.markdown
index 62f08fb9..507c4d1f 100644
--- a/yaml.html.markdown
+++ b/yaml.html.markdown
@@ -25,6 +25,8 @@ YAML doesn't allow literal tab characters at all.
 key: value
 another_key: Another value goes here.
 a_number_value: 100
+# If you want to use number 1 as a value, you have to enclose it in quotes, 
+# otherwise, YAML parser will assume that it is a boolean value of true.
 scientific_notation: 1e+12
 boolean: true
 null_value: null