diff --git a/api/src/com/cloud/api/commands/RegisterIsoCmd.java b/api/src/com/cloud/api/commands/RegisterIsoCmd.java
index 2c30246878d..80a8c8051e3 100755
--- a/api/src/com/cloud/api/commands/RegisterIsoCmd.java
+++ b/api/src/com/cloud/api/commands/RegisterIsoCmd.java
@@ -43,7 +43,7 @@ public class RegisterIsoCmd extends BaseCmd {
     //////////////// API parameters /////////////////////
     /////////////////////////////////////////////////////
 
-    @Parameter(name=ApiConstants.BOOTABLE, type=CommandType.BOOLEAN, description="true if this ISO is bootable")
+    @Parameter(name=ApiConstants.BOOTABLE, type=CommandType.BOOLEAN, description="true if this ISO is bootable. If not passed explicitly its assumed to be true")
     private Boolean bootable;
 
     @Parameter(name=ApiConstants.DISPLAY_TEXT, type=CommandType.STRING, required=true, description="the display text of the ISO. This is usually used for display purposes.")
@@ -61,7 +61,7 @@ public class RegisterIsoCmd extends BaseCmd {
     @Parameter(name=ApiConstants.NAME, type=CommandType.STRING, required=true, description="the name of the ISO")
     private String isoName;
 
-    @Parameter(name=ApiConstants.OS_TYPE_ID, type=CommandType.LONG, description="the ID of the OS Type that best represents the OS of this ISO")
+    @Parameter(name=ApiConstants.OS_TYPE_ID, type=CommandType.LONG, description="the ID of the OS Type that best represents the OS of this ISO. If the iso is bootable this parameter needs to be passed")
     private Long osTypeId;
 
     @Parameter(name=ApiConstants.URL, type=CommandType.STRING, required=true, description="the URL to where the ISO is currently being hosted")