clarify test inputs

p3/README.md

@@ -15,7 +15,7 @@ Learning objectives:
 * Implement logic for uploading and processing CSV and Parquet files
 * Perform computations like summing values from specific columns
 * Manage concurrency with locking in a multi-threaded server
-
+n
 Before starting, please review the [general project directions](../projects.md).
 
 ## Clarifications/Corrections
@@ -101,9 +101,11 @@ docker run --name=server -d -m 512m -p 127.0.0.1:5440:5440 -v ./inputs:/inputs p
 docker exec server python3 upload.py /inputs/test1.csv                              # client
 ```
 
-Note that we are using a volume mount to share make input data visible
-inside your container so that we can `exec` clients inside your
-container with that data.
+Note that you don't need to have an `inputs/test1.csv` file, as the
+autograder will populate your inputs directory with that or whatever
+other test inputs are needed.  As you can also see, we're using a
+volume mount to make the input directory visible inside your container
+so that we can `exec` clients inside your container with that data.
 
 You may also wish to use volume mounts to speed up your development
 process.  For example, if you volume mount your server code (on your