Add +capitalize+ option to Inflector.humanize

So strings can be humanized without being capitalized:

    'employee_salary'.humanize                    # => "Employee salary"
    'employee_salary'.humanize(capitalize: false) # => "employee salary"

1 files changed, 6 insertions, 0 deletions

diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md
index 0370e40012..b72ebd63ee 100644
--- a/guides/source/active_support_core_extensions.md
+++ b/guides/source/active_support_core_extensions.md
@@ -1772,6 +1772,12 @@ The method `humanize` gives you a sensible name for display out of an attribute
 "comments_count".humanize # => "Comments count"
 ```
 
+The capitalization of the first word can be turned off by setting the optional parameter `capitalize` to false:
+
+```ruby
+"author_id".humanize(capitalize: false) # => "author"
+```
+
 The helper method `full_messages` uses `humanize` as a fallback to include attribute names:
 
 ```ruby