diff --git a/docs/developer/how-to.md b/docs/developer/how-to.md
new file mode 100644
index 0000000..d5873d8
--- /dev/null
+++ b/docs/developer/how-to.md
@@ -0,0 +1,24 @@
+## How Tos
+
+### How do I track down a missing LDD.json file needed by the registry?
+Getting this error, what do I do?
+
+```
+[INFO] 404 - Not Found
+[INFO] Will retry in 5 seconds
+[INFO] Downloading https://urldefense.us/v3/__https://pds.nasa.gov/pds4/mission/cassini/v1/PDS4_CASSINI_1D00_1500.JSON__;!!PvBDto6Hs4WbVuu7!PmT82InBdXvS96orrqX3dZ7dmffUFgnIdzMrbUnIpfNFAOwt8q-WPJ4ZAoLFWJLjzGkeNsGYjpU5X6OvyxhI2EWS3XuT$ <https://urldefense.us/v3/__https://pds.nasa.gov/pds4/mission/cassini/v1/PDS4_CASSINI_1D00_1500.JSON__;!!PvBDto6Hs4WbVuu7!PmT82InBdXvS96orrqX3dZ7dmffUFgnIdzMrbUnIpfNFAOwt8q-WPJ4ZAoLFWJLjzGkeNsGYjpU5X6OvyxhI2EWS3XuT$> to /tmp/LDD-12896839279374442894.JSON
+Nov 19, 2024 8:54:43 AM org.apache.http.client.protocol.ResponseProcessCookies processCookies
+WARNING: Invalid cookie header: "Set-Cookie: AWSALB=+AZDT/Dyrlyf8qjBZAO7AS3ZGSz35DYAWwxGQZpyH2y+6rvu9PYeyoDJIzWALA9F5SHbhBMTnBBAXTsijaHOU98DE9A2Mt73BWHSPwbOHrcIV63WkPfXQaCRsxrF; Expires=Tue, 26 Nov 2024 16:54:43 GMT; Path=/". Invalid 'expires' attribute: Tue, 26 Nov 2024 16:54:43 GMT
+Nov 19, 2024 8:54:43 AM org.apache.http.client.protocol.ResponseProcessCookies processCookies
+WARNING: Invalid cookie header: "Set-Cookie: AWSALBCORS=+AZDT/Dyrlyf8qjBZAO7AS3ZGSz35DYAWwxGQZpyH2y+6rvu9PYeyoDJIzWALA9F5SHbhBMTnBBAXTsijaHOU98DE9A2Mt73BWHSPwbOHrcIV63WkPfXQaCRsxrF; Expires=Tue, 26 Nov 2024 16:54:43 GMT; Path=/; SameSite=None; Secure". Invalid 'expires' attribute: Tue, 26 Nov 2024 16:54:43 GMT
+[INFO] 404 - Not Found
+```
+
+Note the version of the LDD, since that is very important. For the example above `PDS4_CASSINI_1D00_1500.JSON`, indicates we need the PDS4 Cassini LDD v1.5.0.0 built with PDS4 IM 1D00.
+
+1. First, check the ldd repository history to see if the version already exists and just needs to be released: https://github.com/pds-data-dictionaries/ldd-cassini/releases
+2. If it does exist as a GitHub release, post to [portal-legacy repo](https://github.com/NASA-PDS/portal-legacy/tree/main/datastandards/schema/released) develop branch, and create pull request to be merged to main.
+3. If it does exist as a GitHub release, look in [portal-legacy repo](https://github.com/NASA-PDS/portal-legacy/tree/main/datastandards/schema/released) to see if an older version of the IngestLDD exists.
+4. If you find an older version of the IngestLDD in portal-legacy, add to the LDD repository, and run LDDTool to generate the JSON: `lddtool -lpJm input_historical_ingestldd.xml`
+5. Post to [portal-legacy repo](https://github.com/NASA-PDS/portal-legacy/tree/main/datastandards/schema/released) develop branch, and create pull request to be merged to main.
+