diff --git a/examples/src/main/scala/org/apache/spark/examples/ml/DecisionTreeExample.scala b/examples/src/main/scala/org/apache/spark/examples/ml/DecisionTreeExample.scala
index 8340d91101ab..54e407394105 100644
--- a/examples/src/main/scala/org/apache/spark/examples/ml/DecisionTreeExample.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/ml/DecisionTreeExample.scala
@@ -112,7 +112,7 @@ object DecisionTreeExample {
         .text(s"input path to test dataset.  If given, option fracTest is ignored." +
           s" default: ${defaultParams.testInput}")
         .action((x, c) => c.copy(testInput = x))
-      opt[String]("<dataFormat>")
+      opt[String]("dataFormat")
         .text("data format: libsvm (default), dense (deprecated in Spark v1.1)")
         .action((x, c) => c.copy(dataFormat = x))
       arg[String]("<input>")
diff --git a/examples/src/main/scala/org/apache/spark/examples/ml/GBTExample.scala b/examples/src/main/scala/org/apache/spark/examples/ml/GBTExample.scala
index c5899b6683c7..33905277c734 100644
--- a/examples/src/main/scala/org/apache/spark/examples/ml/GBTExample.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/ml/GBTExample.scala
@@ -111,7 +111,7 @@ object GBTExample {
         .text(s"input path to test dataset.  If given, option fracTest is ignored." +
         s" default: ${defaultParams.testInput}")
         .action((x, c) => c.copy(testInput = x))
-      opt[String]("<dataFormat>")
+      opt[String]("dataFormat")
         .text("data format: libsvm (default), dense (deprecated in Spark v1.1)")
         .action((x, c) => c.copy(dataFormat = x))
       arg[String]("<input>")
diff --git a/examples/src/main/scala/org/apache/spark/examples/ml/RandomForestExample.scala b/examples/src/main/scala/org/apache/spark/examples/ml/RandomForestExample.scala
index 7f88d2681bca..9f7cad68a459 100644
--- a/examples/src/main/scala/org/apache/spark/examples/ml/RandomForestExample.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/ml/RandomForestExample.scala
@@ -117,7 +117,7 @@ object RandomForestExample {
         .text(s"input path to test dataset.  If given, option fracTest is ignored." +
         s" default: ${defaultParams.testInput}")
         .action((x, c) => c.copy(testInput = x))
-      opt[String]("<dataFormat>")
+      opt[String]("dataFormat")
         .text("data format: libsvm (default), dense (deprecated in Spark v1.1)")
         .action((x, c) => c.copy(dataFormat = x))
       arg[String]("<input>")
diff --git a/examples/src/main/scala/org/apache/spark/examples/mllib/DecisionTreeRunner.scala b/examples/src/main/scala/org/apache/spark/examples/mllib/DecisionTreeRunner.scala
index 262fd2c9611d..b0613632c994 100644
--- a/examples/src/main/scala/org/apache/spark/examples/mllib/DecisionTreeRunner.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/mllib/DecisionTreeRunner.scala
@@ -126,7 +126,7 @@ object DecisionTreeRunner {
         .text(s"input path to test dataset.  If given, option fracTest is ignored." +
           s" default: ${defaultParams.testInput}")
         .action((x, c) => c.copy(testInput = x))
-      opt[String]("<dataFormat>")
+      opt[String]("dataFormat")
         .text("data format: libsvm (default), dense (deprecated in Spark v1.1)")
         .action((x, c) => c.copy(dataFormat = x))
       arg[String]("<input>")
diff --git a/examples/src/main/scala/org/apache/spark/examples/mllib/GradientBoostedTreesRunner.scala b/examples/src/main/scala/org/apache/spark/examples/mllib/GradientBoostedTreesRunner.scala
index 0763a7736305..7416fb5a4084 100644
--- a/examples/src/main/scala/org/apache/spark/examples/mllib/GradientBoostedTreesRunner.scala
+++ b/examples/src/main/scala/org/apache/spark/examples/mllib/GradientBoostedTreesRunner.scala
@@ -69,7 +69,7 @@ object GradientBoostedTreesRunner {
         .text(s"input path to test dataset.  If given, option fracTest is ignored." +
           s" default: ${defaultParams.testInput}")
         .action((x, c) => c.copy(testInput = x))
-      opt[String]("<dataFormat>")
+      opt[String]("dataFormat")
         .text("data format: libsvm (default), dense (deprecated in Spark v1.1)")
         .action((x, c) => c.copy(dataFormat = x))
       arg[String]("<input>")