diff --git a/README.md b/README.md
index 64a16162c..f126606b4 100644
--- a/README.md
+++ b/README.md
@@ -39,3 +39,57 @@ Note docker-compose runs the production docker image (RAILS_ENV=production) as t
 ### Infrastructure
 
 The cloud infrastructure running this application is set up using the [infrastructure repository](https://github.com/communitiesuk/mhclg-data-collection-beta-infrastructure)
+
+
+### Single log submission
+
+The form for this is driven by a json file in `/config/forms/{start_year}_{end_year}.json`
+
+The JSON should follow the structure:
+
+```
+{
+  form_type: [lettings/sales]
+  start_year: yyyy
+  end_year: yyyy
+  sections: {
+    snake case section name string: {
+      label: string,
+      subsections: {
+        snake case subsection name string: {
+          label: string,
+          pages: {
+            snake case page name string: {
+              header: string,
+              description: string,
+              questions: {
+                snake case question name string: {
+                  header: string,
+                  hint_text: string,
+                  type: [text / numeric / radio / select ],
+                  min: integer, (numeric only),
+                  max: integer, (numeric only),
+                  step: integer (numeric only),
+                  answer_options: { (select and radio only)
+                    "0": string,
+                    "1": string
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
+```
+
+Assumptions made by the format:
+
+- All forms have at least 1 section
+- All sections have at least 1 subsection
+- All subsections have at least 1 page
+- All pages have at least 1 question
+- The ActiveRecord case log model has a field for each question name (must match)
+- Text not required by a page/question such as a header or hint text should be passed as an empty string