Case Sensitive Template Designation

When creating a child theme in WordPress, this codex is more than adequate to get rolling. However, I did run into one bump this go around. The name input for “Template:” is case sensitive.

This style.css header:

/*
 Theme Name:   Twenty Fifteen Child
 Theme URI:    http://example.com/twenty-fifteen-child/
 Description:  Twenty Fifteen Child Theme
 Author:       John Doe
 Author URI:   http://example.com
 Template:     twentyfifteen
 ...
*/

is not the same as:

/*
 Theme Name:   Twenty Fifteen Child
 Theme URI:    http://example.com/twenty-fifteen-child/
 Description:  Twenty Fifteen Child Theme
 Author:       John Doe
 Author URI:   http://example.com
 Template:     Twentyfifteen
 ...
*/

Now you know, and perhaps I can remember!