--- a/docs/data_processing/uploading_measurements.rst	Wed Mar 12 11:44:56 2014 +0200
+++ b/docs/data_processing/uploading_measurements.rst	Wed Mar 12 11:50:52 2014 +0200
@@ -73,7 +73,12 @@
 Form Validation
 ---------------
 
-The data you submit in the form are check in two stages.
+The aim of form validation is to detect errors in your submitted data as early
+as possible. In this way you can save time by correcting errors before the 
+processing of your data fails. 
+
+The data you provide in the form are check in two stages, before you submit 
+and after you submit the form.
 
 Before you submit the form
 ~~~~~~~~~~~~~~~~~~~~~~~~~~