anchor.diff:  link:../architecture/core_concepts/builds_and_image_streams.html#source-build[S2I
   build strategy].
   
  -[[force-pull]]
  +[[s2i-force-pull]]
   
   === Force Pull
   
  -By default, if the builder image specified in the build configuration is available locally on the node, that image will be used.  However, to override the local image and refresh it from
  -the registry to which the ImageStream points, create a `*buildConfig*` with the "forcePull" flag set to true:
  +By default, if the builder image specified in the build configuration is
  +available locally on the node, that image will be used. However, to override the
  +local image and refresh it from the registry to which the image stream points,
  +create a `*buildConfig*` with the `*forcePull*` flag set to *true*:
   
   ====
   
  
positive.code: ====
  +
  In this case, the `*sourceStrategy*` definition is consuming the `latest` tag of
  the ImageStream named `ruby-20-centos7` located within this namespace.
  
  . Define an image change trigger:
  +
  
negative.code: ====
  +
  This defines an image change trigger that monitors the `*ImageStream*` and
  `*Tag*` as defined by the strategy's `*from*` field. When a change occurs, a new
  build is triggered and is supplied with an immutable Docker tag that points to
  the new image that was just created. This new image will be used by the strategy
  when it executes for the build. For example, the resulting build will be:
  +
  ====
  