Update README.md

src/modules/README.md

@@ -44,7 +44,8 @@ We treat these factors as categorical qualities, subclasse of PATO:quality. We f
 We also included some grouping categories, such as `age category`, `housing quality`, or `quality about a language spoken`. These grouping categories are used to logically define measurement datum classes that group together different data classes based on what they are about. This aids in browsing and searching.
 
 ## Final variables
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 The leaf nodes for all the variables are constructed using design patterns. See the readme file under src/pattern/acs5_variable_sheets
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