Update README.md

README.md

@@ -6,3 +6,34 @@ only return one row but it returns three.
 # Quickstart
 
 `./mvnw test`
+
+# Explanation
+
+Given this table:
+```
+CREATE TABLE "queue" (
+	"id" BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+	"action" TEXT NOT NULL
+);
+
+Repeat these queries for a while:
+```
+INSERT INTO queue (action) VALUES ('action1');
+INSERT INTO queue (action) VALUES ('action2');
+INSERT INTO queue (action) VALUES ('action3');
+
+# repeat three times
+DELETE FROM queue
+WHERE
+	id IN (
+		SELECT id
+		FROM queue
+		ORDER BY id
+		LIMIT 1
+		FOR UPDATE
+		SKIP LOCKED
+	)
+RETURNING *;
+```
+
+If you check the number of results from the delete query it will not return one result but three. That should not be the case due to the LIMIT statement in the query.