diff --git a/core/src/main/scala/pl/iterators/baklava/core/model/RouteParameterRepresentation.scala b/core/src/main/scala/pl/iterators/baklava/core/model/RouteParameterRepresentation.scala
index f4be7cb..230616d 100644
--- a/core/src/main/scala/pl/iterators/baklava/core/model/RouteParameterRepresentation.scala
+++ b/core/src/main/scala/pl/iterators/baklava/core/model/RouteParameterRepresentation.scala
@@ -1,18 +1,42 @@
 package pl.iterators.baklava.core.model
 
 import scala.reflect.runtime.universe.TypeTag
+import scala.util.Random
 
 case class RouteParameterRepresentation[T](
   name: String,
-  required: Boolean,
-  sampleValue: T,
-  marshaller: T => String,
+  valueGenerator: () => T,
+  marshaller: T => String = RouteParameterRepresentation.marshaller[T] _,
+  required: Boolean = false,
+  seq: Boolean = false,
+  seqMin: Int = 2,
+  seqMax: Int = 5,
   enumValues: Option[Seq[T]] = None
 )(implicit typeTag: TypeTag[T]) {
 
-  lazy val marshall: String = marshaller(sampleValue)
+  lazy val sampleValue: T =
+    if (!seq) valueGenerator() else sys.error("sampleValue should not be called on seq parameter")
+
+  lazy val seqSampleValue: Seq[T] =
+    if (seq) (0 until Random.nextInt(1 + seqMax - seqMin) + seqMin).map(_ => valueGenerator())
+    else sys.error("seqSampleValue should not be called on seq parameter")
 
   lazy val enums: Option[Seq[String]] = enumValues.map(values => values.map(marshaller))
 
-  lazy val scalaType: String = typeTag.tpe.toString
+  lazy val simpleType: String = typeTag.tpe.toString
+
+  lazy val queryString: String =
+    if (seq) {
+      seqSampleValue.map(v => s"$name=${marshaller(v)}").mkString("&")
+    } else
+      s"$name=${marshaller(sampleValue)}"
+
+}
+
+object RouteParameterRepresentation {
+  def marshaller[T](value: T): String =
+    value match {
+      case string: String => string
+      case other          => other.toString
+    }
 }
diff --git a/core/src/main/scala/pl/iterators/baklava/core/model/RouteRepresentation.scala b/core/src/main/scala/pl/iterators/baklava/core/model/RouteRepresentation.scala
index 3072b76..1666c69 100644
--- a/core/src/main/scala/pl/iterators/baklava/core/model/RouteRepresentation.scala
+++ b/core/src/main/scala/pl/iterators/baklava/core/model/RouteRepresentation.scala
@@ -34,9 +34,7 @@ case class RouteRepresentation[Request, Response](
     val parametersPath = Option
       .when(requiredParams.nonEmpty) {
         requiredParams
-          .map { param =>
-            s"${param.name}=${param.marshall}"
-          }
+          .map(_.queryString)
           .mkString("?", "&", "")
       }
       .getOrElse("")
@@ -48,9 +46,7 @@ case class RouteRepresentation[Request, Response](
     val parametersPath = Option
       .when(parameters.nonEmpty) {
         parameters
-          .map { param =>
-            s"${param.name}=${param.marshall}"
-          }
+          .map(_.queryString)
           .mkString("?", "&", "")
       }
       .getOrElse("")
@@ -64,4 +60,7 @@ case class RouteRepresentation[Request, Response](
   def getParamValue[T](name: String): Option[T] =
     parameters.find(_.name == name).map(_.sampleValue.asInstanceOf[T])
 
+  def getSeqParamValue[T](name: String): Option[Seq[T]] =
+    parameters.find(_.name == name).map(_.seqSampleValue.asInstanceOf[Seq[T]])
+
 }
diff --git a/formatter-openapi/src/main/scala/pl/iterators/baklava/formatter/openapi/OpenApiFormatterWorker.scala b/formatter-openapi/src/main/scala/pl/iterators/baklava/formatter/openapi/OpenApiFormatterWorker.scala
index a98e0dd..ad6e477 100644
--- a/formatter-openapi/src/main/scala/pl/iterators/baklava/formatter/openapi/OpenApiFormatterWorker.scala
+++ b/formatter-openapi/src/main/scala/pl/iterators/baklava/formatter/openapi/OpenApiFormatterWorker.scala
@@ -87,14 +87,21 @@ class OpenApiFormatterWorker(jsonSchemaToSwaggerSchemaWorker: JsonSchemaToSwagge
 
   private def queryParamsToParams(parameters: List[RouteParameterRepresentation[_]]): List[Parameter] =
     parameters.map { param =>
-      val schema = new StringSchema
-      schema.setExample(param.sampleValue)
+      val itemSchema = new StringSchema
+      itemSchema.setExample(param.valueGenerator())
       param.enums.foreach { values =>
-        schema.setEnum(values.toList.asJava)
+        itemSchema.setEnum(values.toList.asJava)
       }
 
+      val schema: Schema[_] =
+        if (param.seq) {
+          val arraySchema = new ArraySchema
+          arraySchema.setItems(itemSchema)
+          arraySchema
+        } else itemSchema
+
       val p = new Parameter()
-      p.setName(param.name)
+      if (param.seq) p.setName(s"${param.name}[]") else p.setName(param.name)
       p.setIn("query")
       p.setRequired(param.required)
       p.setSchema(schema)
diff --git a/formatter/src/main/scala/pl/iterators/baklava/formatter/SimpleDocsFormatter.scala b/formatter/src/main/scala/pl/iterators/baklava/formatter/SimpleDocsFormatter.scala
index 3695ebe..3a5f8d9 100644
--- a/formatter/src/main/scala/pl/iterators/baklava/formatter/SimpleDocsFormatter.scala
+++ b/formatter/src/main/scala/pl/iterators/baklava/formatter/SimpleDocsFormatter.scala
@@ -4,7 +4,6 @@ import com.github.andyglow.json.JsonFormatter
 import com.github.andyglow.jsonschema.AsValue
 import json.schema.Version.Draft07
 import pl.iterators.baklava.core.model.EnrichedRouteRepresentation
-import pl.iterators.baklava.core.utils.option.RichOptionCompanion
 
 import java.io.{File, FileWriter, PrintWriter}
 import scala.util.Try
@@ -133,7 +132,13 @@ class SimpleDocsFormatter extends Formatter {
         },
         Option.when(r.parameters.nonEmpty) {
           s"<tr><td><b>PARAMETERS</b></td><td>" +
-            s"${r.parameters.map(h => s"${h.name} [${h.scalaType}] ${Option.when(h.required)(s"<b style='color: red'>*</b>").getOrElse("")}").mkString("<br/>")}" +
+            s"${r.parameters
+                .map(h =>
+                  s"${h.name}${if (h.seq) "[]" else ""}${Option.when(h.required)(s"<b style='color: red'>*</b>").getOrElse("")}: ${h.simpleType}${if (h.seq) "[]"
+                    else ""} " +
+                    s"(${h.enums.map(enums => enums.mkString("possible values: ", ", ", "")).getOrElse(s"example: ${h.valueGenerator()}")})"
+                )
+                .mkString("<br/>")}" +
             s"</td></tr>" +
             s"<tr><td><b>ROUTE WITH MINIMAL PARAMS</b></td><td>${r.routePathWithRequiredParameters}</td></tr>" +
             s"<tr><td><b>ROUTE WITH ALL PARAMS</b></td><td>${r.routePathWithAllParameters}</td></tr>"