finish pq\Query

[mdref/mdref-pq-gateway] / pq-gateway / pq / Query / Expr / add.md

diff --git a/pq-gateway/pq/Query/Expr/add.md b/pq-gateway/pq/Query/Expr/add.md
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+# pq\Query\Expr pq\Query\Expr::add(pq\Query\Expr $next)
+
+Add an expression at the end of the linked list.
+
+## Params:
+
+* pq\Query\Expr $next  
+  The expression to add.
+
+## Returns:
+
+* pq\Query\Expr, self.
+
+## Throws:
+
+* UnexpectedValueException, if the receiving expression is NULL.