diff --git a/Running-from-source.md b/Running-from-source.md
index b416b88..2bfd4fa 100644
--- a/Running-from-source.md
+++ b/Running-from-source.md
@@ -164,13 +164,28 @@ All other dependencies will be handled by `pip` below.
 Choose one of the following:
 
 1. Using a zip of the latest stable source. Download and extract the
-     [latest stable source code](https://github.com/EDCD/EDMarketConnector/archive/stable.zip).
+  [latest stable source code](https://github com/EDCD/EDMarketConnector/archive/stable.zip).
+
+    **NB: Some niche functionality  will not work without two files from the
+    [FDevIDs repository](https://github.com/EDCD/FDevIDs), which are included 
+    in the Windows installer builds.**  You specifically need:
+    1. [commodity.csv](https://github.com/EDCD/FDevIDs/raw/master/commodity.csv)
+    2. [rare_commodity.csv](https://github.com/EDCD/FDevIDs/raw/master/rare_commodity.csv)
+
+   which should be placed in `FDevIDs/` that unzipping the release archive 
+   will have created.
+
+    Without these the "Settings" > "Output" > "Market data in CSV format file"
+    feature will not work.
+  
  
 1. OR Clone and checkout the source using git:
-     1. `cd <directory you want t be the parent of the source>`
-     1. `git clone https://github.com/EDCD/EDMarketConnector.git`
-     1. `cd EDMarketConnector`
-     1. `git checkout stable`
+   1. `cd <directory you want t be the parent of the source>`
+   2. `git clone https://github.com/EDCD/EDMarketConnector.git`
+   3. `cd EDMarketConnector`
+   4. `git checkout stable`
+   5. `git submodule init`  # Necessary to populate `FDevIDs/`
+   6. `git submodule update --checkout`  # Necessary to populate `FDevIDs/`
 
 As per [Contributing.md](https://github.com/EDCD/EDMarketConnector/blob/main/Contributing.md#git-branch-structure-and-tag-conventions)
 `stable` will contain the latest released code, or possibly some extra