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-rw-r--r--yaml.html.markdown4
1 files changed, 4 insertions, 0 deletions
diff --git a/yaml.html.markdown b/yaml.html.markdown
index ab0f9d55..d51b2147 100644
--- a/yaml.html.markdown
+++ b/yaml.html.markdown
@@ -121,6 +121,10 @@ other_anchor: *anchor_name
base: &base
name: Everyone has same name
+# The regexp << is called Merge Key Language-Independent Type. It is is used to
+# indicate that all the keys of one or more specified maps should be inserted
+# into the current map.
+
foo: &foo
<<: *base
age: 10