diff -r 9985a046f1b5 closed/src/jdk.javadoc/share/specs/doc-comment-spec.md
--- a/closed/src/jdk.javadoc/share/specs/doc-comment-spec.md	Sat Oct 13 13:44:51 2018 -0700
+++ b/closed/src/jdk.javadoc/share/specs/doc-comment-spec.md	Tue Oct 16 14:54:17 2018 +0530
@@ -623,6 +623,18 @@
 
 Introduced in JDK 10. 
 
+#### `{@systemProperty}`
+
+* `{@systemProperty` _property-name_ `}`
+
+Identify property-name as the name of a system property. The name should be a 
+"dotted identifier". In particular, it must not contain white space characters, 
+or characters such as }. No other content is permitted in the tag; the possibility 
+of additional content is reserved for future use. The tag can be used in the documentation
+comments for modules, packages, types, fields and executable members.
+
+Introduced in JDK 12.
+
 #### `{@value}`
 
 * `{@value` _package_`.`_class_`#`_field_ `}`
@@ -677,6 +689,7 @@
 | [`@serialField`](#serialfield)        |          |         |         |         |             |         |    *    |
 | [`@since`](#since)                    | ✓  | ✓ | ✓ | ✓ | ✓     | ✓ | ✓ |
 | [`{@summary}`](#summary)              | ✓  | ✓ | ✓ | ✓ | ✓     | ✓ | ✓ |
+| [`{@systemProperty}`](#systemProperty)|          | ✓ | ✓ | ✓ | ✓     | ✓ | ✓ |
 | [`@throws`](#throws)                  |          |         |         |         | ✓     | ✓ |         |
 | [`@uses`](#uses)                      |          | ✓ |         |         |             |         |         |
 | [`{@value}`](#value)                  | ✓  |         | ✓ | ✓ | ✓     | ✓ | ✓ |