📚 Doc not to add to Gemfile

README.md

@@ -156,7 +156,9 @@ Theme files (views, css, etc) can be added in the the Knapsack. We recommend add
 
 ### Gems
 
-It can be useful to add additional gems to the bundle. This can be done w/o editing Hyku by adding them to the [./bundler.d/example.rb](./bundler.d/example.rb].  [See the bundler-inject documentation for more details] on overriding and adding gems.
+It can be useful to add additional gems to the bundle. This can be done w/o editing Hyku by adding them to the [./bundler.d/example.rb](./bundler.d/example.rb].  [See the bundler-inject documentation for more details](https://github.com/kbrock/bundler-inject/) on overriding and adding gems.
+
+**NOTE:** Do not add gems to the gemspec nor Gemfile.  When you add to the knapsack Gemfile/gemspec, when you bundle, you'll update the Hyku Gemfile; which will mean you might be updating Hyku prime with knapsack installation specific dependencies.  Instead add gems to `./bundler.d/example.rb`.
 
 ## Converting a Fork of Hyku Prime to a Knapsack