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diff --git a/pq-gateway/pq/Query/Expr/isNull.md b/pq-gateway/pq/Query/Expr/isNull.md
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+# bool pq\Query\Expr::isNull()
+
+Whether the expression is the literal NULL.
+
+## Params:
+
+None.
+
+## Returns:
+
+* bool, whether the expression case insensitively equals NULL.