diff --git a/docs/models/build_a_model/build_source_code.md b/docs/models/build_a_model/build_source_code.md
index d40bdf94f..de94d3de0 100644
--- a/docs/models/build_a_model/build_source_code.md
+++ b/docs/models/build_a_model/build_source_code.md
@@ -29,8 +29,6 @@ As an example, in the following instructions we will show how to modify [MOM5 co
 !!! tip
     The following instructions are valid (with simple tweaks) for all [ACCESS models].
 
-## Prerequisites
-
 - **NCI account**<br>
   Before building a model, you need to [Set Up your NCI Account](/getting_started/set_up_nci_account).
 
@@ -127,6 +125,11 @@ spack concretize -f --reuse-deps
     spack concretize -f --fresh
     ```
 
+    The version of [`access-nri/access-spack-packages`](https://github.com/ACCESS-NRI/access-spack-packages) must be compatible with the environment. If there are concretization errors try checking the version you cloned is the same as the version used in the deployment repository.
+
+## Prerequisites
+
+
 <terminal-window lineDelay=0>
   <terminal-line data="input" lineDelay=200 directory="[mom5_dev]" class="spack">
     spack concretize -f --reuse-deps
diff --git a/docs/models/build_a_model/create_a_prerelease.md b/docs/models/build_a_model/create_a_prerelease.md
index 5ce72f99f..03a2b2dda 100644
--- a/docs/models/build_a_model/create_a_prerelease.md
+++ b/docs/models/build_a_model/create_a_prerelease.md
@@ -54,6 +54,10 @@ For more information on the `spack.yaml` file, refer to  [ACCESS-NRI's DevDocs](
 
 The `config` directory contains a single `versions.json` file. This file allows customisation of both the version of [`access-nri/spack`](https://github.com/ACCESS-NRI/spack) used to deploy the model and the version of [`access-nri/spack-packages`](https://github.com/ACCESS-NRI/spack-packages) that will source the recipes for the _Spack_ packages.
 
+    !!! warning
+        It is important that the version of [`access-nri/spack-packages`](https://github.com/ACCESS-NRI/spack-packages) is compatible with the environment. 
+        If there are concretization errors try checking this.
+
 ## Trigger model prerelease and release build deployments
 
 As mentioned above, prerelease build deployments are triggered by a push of one or more commits within a model deployment repository's open PR. When the PR is merged, a release build deployment is created.<br>