diff --git a/doc/ref.php b/doc/ref.php
index 21b824e3..f34ed038 100644
--- a/doc/ref.php
+++ b/doc/ref.php
@@ -1116,6 +1116,32 @@ EOL;
Only throws an exception if it is thrown by hasher or key_equal.
+
+
+
+
+
+ K&&
+
+ size_type
+
+ The number of elements erased.
+
+
+ Only throws an exception if it is thrown by hasher or key_equal.
+
+
+ Erase all elements with key equivalent to k.
+
+ This overload only participates in overload resolution if Hash::is_transparent
+ and Pred::is_transparent are valid member typedefs and neither iterator
+ nor const_iterator are implicitly convertible from K. The library
+ assumes that Hash is callable with both K and Key and
+ that Pred is transparent. This enables heterogeneous lookup which avoids the cost of
+ instantiating an instance of the Key type.
+
+
+
const_iterator