diff --git a/README.md b/README.md
index 7e9135b..dfbf7d8 100644
--- a/README.md
+++ b/README.md
@@ -126,6 +126,24 @@ To specify encoding, add the following to your `build.sbt`
 scalacOptions += Seq("-encoding", "UTF-8")
 ```
 
+## Uploading coverage from multiple jobs in parallel
+
+Coveralls supports multiple CI jobs recording and uploading coverage, if a special flag is set and [a webhook](https://docs.coveralls.io/parallel-build-webhook) is posted once all jobs are complete.
+
+### Put the flag directly in your `build.sbt`
+
+``` scala
+import org.scoverage.coveralls.Imports.CoverallsKeys._
+
+coverallsParallel := true
+```
+
+### Add an environment variable
+
+Add an environment variable `COVERALLS_PARALLEL`, for example:
+
+    export COVERALLS_PARALLEL=true
+
 ## Using Travis-Pro
 
 It is important to set the correct `service_name` when using Travis-Pro.  The default is to use `travis-ci`.  To override this value, add the following to your `build.sbt`
diff --git a/src/main/scala/org/scoverage/coveralls/CoverallPayloadWriter.scala b/src/main/scala/org/scoverage/coveralls/CoverallPayloadWriter.scala
index 6c4c191..f42e9e0 100644
--- a/src/main/scala/org/scoverage/coveralls/CoverallPayloadWriter.scala
+++ b/src/main/scala/org/scoverage/coveralls/CoverallPayloadWriter.scala
@@ -12,6 +12,7 @@ class CoverallPayloadWriter(
     repoToken: Option[String],
     travisJobId: Option[String],
     serviceName: Option[String],
+    parallel: Boolean,
     gitClient: GitClient) {
 
   val repoRootDirStr = repoRootDir.getCanonicalPath.replace(File.separator, "/") + "/"
@@ -35,6 +36,7 @@ class CoverallPayloadWriter(
     writeOpt("service_name", serviceName)
     writeOpt("service_job_id", travisJobId)
     writeOpt("service_pull_request", sys.env.get("CI_PULL_REQUEST"))
+    gen.writeBooleanField("parallel", parallel)
 
     addGitInfo
 
diff --git a/src/main/scala/org/scoverage/coveralls/CoverallsPlugin.scala b/src/main/scala/org/scoverage/coveralls/CoverallsPlugin.scala
index 97047a4..be7d6f3 100644
--- a/src/main/scala/org/scoverage/coveralls/CoverallsPlugin.scala
+++ b/src/main/scala/org/scoverage/coveralls/CoverallsPlugin.scala
@@ -22,6 +22,7 @@ object Imports {
     val coverallsEncoding = SettingKey[String]("encoding")
     val coverallsEndpoint = SettingKey[Option[String]]("coverallsEndpoint")
     val coverallsGitRepoLocation = SettingKey[Option[String]]("coveralls-git-repo")
+    val coverallsParallel = SettingKey[Boolean]("coverallsParallel")
   }
 }
 
@@ -46,7 +47,8 @@ object CoverallsPlugin extends AutoPlugin {
     coverallsServiceName := travisJobIdent map { _ => "travis-ci" },
     coverallsFile := crossTarget.value / "coveralls.json",
     coberturaFile := crossTarget.value / "coverage-report" / "cobertura.xml",
-    coverallsGitRepoLocation := Some(".")
+    coverallsGitRepoLocation := Some("."),
+    coverallsParallel := sys.env.get("COVERALLS_PARALLEL") == Some("true")
   )
 
   val aggregateFilter = ScopeFilter(inAggregates(ThisProject), inConfigurations(Compile)) // must be outside of the 'coverageAggregate' task (see: https://github.com/sbt/sbt/issues/1095 or https://github.com/sbt/sbt/issues/780)
@@ -83,6 +85,7 @@ object CoverallsPlugin extends AutoPlugin {
       repoToken,
       travisJobIdent,
       coverallsServiceName.value,
+      coverallsParallel.value,
       new GitClient(repoRootDirectory)(log)
     )
 
diff --git a/src/test/scala/com/github/theon/coveralls/CoverallPayloadWriterTest.scala b/src/test/scala/com/github/theon/coveralls/CoverallPayloadWriterTest.scala
index 3a4bd15..9f385e7 100644
--- a/src/test/scala/com/github/theon/coveralls/CoverallPayloadWriterTest.scala
+++ b/src/test/scala/com/github/theon/coveralls/CoverallPayloadWriterTest.scala
@@ -21,8 +21,8 @@ class CoverallPayloadWriterTest extends WordSpec with BeforeAndAfterAll with Mat
     }
   }
 
-  def coverallsWriter(writer: Writer, tokenIn: Option[String], travisJobIdIn: Option[String], serviceName: Option[String]) =
-    new CoverallPayloadWriter(new File("").getAbsoluteFile, new File(""), tokenIn, travisJobIdIn, serviceName, testGitClient) {
+  def coverallsWriter(writer: Writer, tokenIn: Option[String], travisJobIdIn: Option[String], serviceName: Option[String], parallel: Boolean) =
+    new CoverallPayloadWriter(new File("").getAbsoluteFile, new File(""), tokenIn, travisJobIdIn, serviceName, parallel, testGitClient) {
       override def generator(file: File) = {
         val factory = new JsonFactory()
         factory.createGenerator(writer)
@@ -36,13 +36,13 @@ class CoverallPayloadWriterTest extends WordSpec with BeforeAndAfterAll with Mat
 
       "generate a correct starting payload with travis job id" in {
         val w = new StringWriter()
-        val coverallsW = coverallsWriter(w, Some("testRepoToken"), Some("testTravisJob"), Some("travis-ci"))
+        val coverallsW = coverallsWriter(w, Some("testRepoToken"), Some("testTravisJob"), Some("travis-ci"), false)
 
         coverallsW.start
         coverallsW.flush()
 
         w.toString should equal(
-          """{"repo_token":"testRepoToken","service_name":"travis-ci","service_job_id":"testTravisJob",""" +
+          """{"repo_token":"testRepoToken","service_name":"travis-ci","service_job_id":"testTravisJob","parallel":false,""" +
             expectedGit +
             ""","source_files":["""
         )
@@ -50,13 +50,13 @@ class CoverallPayloadWriterTest extends WordSpec with BeforeAndAfterAll with Mat
 
       "generate a correct starting payload without travis job id" in {
         val w = new StringWriter()
-        val coverallsW = coverallsWriter(w, Some("testRepoToken"), None, None)
+        val coverallsW = coverallsWriter(w, Some("testRepoToken"), None, None, false)
 
         coverallsW.start
         coverallsW.flush()
 
         w.toString should equal(
-          """{"repo_token":"testRepoToken",""" +
+          """{"repo_token":"testRepoToken","parallel":false,""" +
             expectedGit +
             ""","source_files":["""
         )
@@ -64,7 +64,7 @@ class CoverallPayloadWriterTest extends WordSpec with BeforeAndAfterAll with Mat
 
       "add source files correctly" in {
         val w = new StringWriter()
-        val coverallsW = coverallsWriter(w, Some("testRepoToken"), None, Some("travis-ci"))
+        val coverallsW = coverallsWriter(w, Some("testRepoToken"), None, Some("travis-ci"), false)
 
         val projectRoot = new File("").getAbsolutePath.replace(File.separator, "/") + "/"
 
@@ -80,13 +80,27 @@ class CoverallPayloadWriterTest extends WordSpec with BeforeAndAfterAll with Mat
 
       "end the file correctly" in {
         val w = new StringWriter()
-        val coverallsW = coverallsWriter(w, Some("testRepoToken"), None, Some("travis-ci"))
+        val coverallsW = coverallsWriter(w, Some("testRepoToken"), None, Some("travis-ci"), false)
 
         coverallsW.start
         coverallsW.end()
 
         w.toString should endWith("]}")
       }
+
+      "include parallel correctly" in {
+        val w = new StringWriter()
+        val coverallsW = coverallsWriter(w, Some("testRepoToken"), None, None, true)
+
+        coverallsW.start
+        coverallsW.flush()
+
+        w.toString should equal(
+          """{"repo_token":"testRepoToken","parallel":true,""" +
+            expectedGit +
+            ""","source_files":["""
+        )
+      }
     }
   }
 }