@@ -95,14 +95,17 @@ nested properties, the tool itself needs to implement this functionality.

 To add labels to an image, use the `LABEL` instruction in your Dockerfile:

-    LABEL [<namespace>.]<key>[=<value>] ...

+    LABEL [<namespace>.]<key>=<value> ...

-The `LABEL` instruction adds a label to your image, optionally with a value.

+The `LABEL` instruction adds a label to your image. A `LABEL` consists of a `<key>`

+and a `<value>`.

+Use an empty string for labels  that don't have a `<value>`,

 Use surrounding quotes or backslashes for labels that contain

 white space characters in the `<value>`:

     LABEL vendor=ACME\ Incorporated

-    LABEL com.example.version.is-beta

+    LABEL com.example.version.is-beta=

+    LABEL com.example.version.is-production=""

     LABEL com.example.version="0.0.1-beta"

     LABEL com.example.release-date="2015-02-12"

@@ -114,7 +117,8 @@ in a single instruction:

 Long lines can be split up by using a backslash (`\`) as continuation marker:

     LABEL vendor=ACME\ Incorporated \

-          com.example.is-beta \

+          com.example.is-beta= \

+          com.example.is-production="" \

           com.example.version="0.0.1-beta" \

           com.example.release-date="2015-02-12"

@@ -130,6 +134,7 @@ You can view the labels via the `docker inspect` command:

     "Labels": {

         "vendor": "ACME Incorporated",

         "com.example.is-beta": "",

+        "com.example.is-production": "",

         "com.example.version": "0.0.1-beta",

         "com.example.release-date": "2015-02-12"

     }

@@ -138,7 +143,7 @@ You can view the labels via the `docker inspect` command:

     # Inspect labels on container

     $ docker inspect -f "{{json .Config.Labels }}" 4fa6e0f0c678

-    {"Vendor":"ACME Incorporated","com.example.is-beta":"","com.example.version":"0.0.1-beta","com.example.release-date":"2015-02-12"}

+    {"Vendor":"ACME Incorporated","com.example.is-beta":"", "com.example.is-production":"", "com.example.version":"0.0.1-beta","com.example.release-date":"2015-02-12"}

     # Inspect labels on images

     $ docker inspect -f "{{json .ContainerConfig.Labels }}" myimage

@@ -156,20 +156,23 @@ A Dockerfile is similar to a Makefile.

   the image.

 **LABEL**

-  -- `LABEL <key>[=<value>] [<key>[=<value>] ...]`or 

+  -- `LABEL <key>=<value> [<key>=<value> ...]`or 

   ```

   LABEL <key>[ <value>]

   LABEL <key>[ <value>]

   ...

   ```

   The **LABEL** instruction adds metadata to an image. A **LABEL** is a

-  key-value pair. To include spaces within a **LABEL** value, use quotes and

+  key-value pair. To specify a **LABEL** without a value, simply use an empty

+  string. To include spaces within a **LABEL** value, use quotes and

   backslashes as you would in command-line parsing.

   ```

   LABEL com.example.vendor="ACME Incorporated"

-  or

   LABEL com.example.vendor "ACME Incorporated"

+  LABEL com.example.vendor.is-beta ""

+  LABEL com.example.vendor.is-beta=

+  LABEL com.example.vendor.is-beta=""

   ```

   An image can have more than one label. To specify multiple labels, separate