diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
index 12c24cc768225..319e69c560914 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
@@ -335,7 +335,8 @@ object FunctionRegistry {
     val df = clazz.getAnnotation(classOf[ExpressionDescription])
     if (df != null) {
       (name,
-        (new ExpressionInfo(clazz.getCanonicalName, name, df.usage(), df.extended()),
+        (new ExpressionInfo(
+          clazz.getCanonicalName, name, df.usage().stripMargin, df.extended().stripMargin),
         builder))
     } else {
       (name, (new ExpressionInfo(clazz.getCanonicalName, name), builder))
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
index 741ad1f3efd8a..95b6266f1947f 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
@@ -26,6 +26,10 @@ import org.apache.spark.sql.types._
 /**
  * Given an array or map, returns its size.
  */
+@ExpressionDescription(
+  usage = "_FUNC_(column) - Returns the length of the array or map stored in the column",
+  extended = """> SELECT _FUNC_(array("b", "d", "c", "a"));
+    | 4""")
 case class Size(child: Expression) extends UnaryExpression with ExpectsInputTypes {
   override def dataType: DataType = IntegerType
   override def inputTypes: Seq[AbstractDataType] = Seq(TypeCollection(ArrayType, MapType))
@@ -44,6 +48,11 @@ case class Size(child: Expression) extends UnaryExpression with ExpectsInputType
  * Sorts the input array in ascending / descending order according to the natural ordering of
  * the array elements and returns it.
  */
+@ExpressionDescription(
+  usage = """_FUNC_(array, ascendingOrder) - Sorts the input array for the given column in
+    | ascending / descending order, according to the natural ordering of the array elements""",
+  extended = """> SELECT _FUNC_(array("b", "d", "c", "a"), false);
+    | ["d","c","b","a"]""")
 case class SortArray(base: Expression, ascendingOrder: Expression)
   extends BinaryExpression with ExpectsInputTypes with CodegenFallback {
 
@@ -125,6 +134,9 @@ case class SortArray(base: Expression, ascendingOrder: Expression)
 /**
  * Checks if the array (left) has the element (right)
  */
+@ExpressionDescription(
+  usage = "_FUNC_(array, value) - Returns true if the array contains the value",
+  extended = "> SELECT _FUNC_(array(2, 9, 8), 9);\n true")
 case class ArrayContains(left: Expression, right: Expression)
   extends BinaryExpression with ImplicitCastInputTypes {
 
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/commands.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/commands.scala
index e6621e0f50a9e..9666a5b725a46 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/commands.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/commands.scala
@@ -28,9 +28,9 @@ import org.apache.spark.sql.types.StringType
 trait Command
 
 /**
- * Returned for the "DESCRIBE [EXTENDED] FUNCTION functionName" command.
+ * Returned for the "DESCRIBE FUNCTION [EXTENDED] functionName" command.
  * @param functionName The function to be described.
- * @param isExtended True if "DESCRIBE EXTENDED" is used. Otherwise, false.
+ * @param isExtended True if "DESCRIBE FUNCTION EXTENDED" is used. Otherwise, false.
  */
 private[sql] case class DescribeFunction(
     functionName: String,