diff --git a/docs/source/change-log.md b/docs/source/change-log.md
index 7586911b..5eb2f352 100644
--- a/docs/source/change-log.md
+++ b/docs/source/change-log.md
@@ -4,8 +4,9 @@
 
 To update a develop installation to this version, you need to run `cathy install system --update`. This should clone  new repositories and install all modified modules in the Anaconda environment. You may also have to update the Catharsys installation in Blender using `cathy blender init -c [your config]`.
 
-- **Blender 4.0 Support**
+- **Blender**
   - Blender 4 has some breaking changes in its' Python code. The Catharsys code has been adapted to support Blender 3.x and 4.0.
+  - Only the Catharsys modules that are needed in Blender are installed to Blender python now. The list of modules that are installed is given in the file `image-render-actions-std-blender/src/catharsys/plugins/std/blender/data/blender-install.json5`. The module names are actually interpreted as regular expressions.
 
 - **Generative AI Action**
   - A generative AI action repository is now added as `image-render-generative`.
diff --git a/src/catharsys/setup/module.py b/src/catharsys/setup/module.py
index ed82a25c..7abb1c63 100644
--- a/src/catharsys/setup/module.py
+++ b/src/catharsys/setup/module.py
@@ -597,7 +597,19 @@ def InstallModules(
     bForceDist: bool,
     bForceInstall: bool,
     bSourceDist: bool,
+    lIncludeRegEx: list[str] = [],
 ):
+    lIncRegEx: list[str] = []
+    if isinstance(g_debug_lInstallModules, list) and len(g_debug_lInstallModules) > 0:
+        lIncRegEx.extend(g_debug_lInstallModules)
+    # endif
+
+    if isinstance(lIncludeRegEx, list) and len(lIncludeRegEx) > 0:
+        lIncRegEx.extend(lIncludeRegEx)
+    # endif
+
+    # print(f"lIncRegEx: {lIncRegEx}")
+
     ForEach(
         bForceDist=bForceDist,
         bSourceDist=bSourceDist,
@@ -605,7 +617,7 @@ def InstallModules(
         # funcRunDist=CreateInstallDistHandler(sPathPythonProg, bForceInstall),
         funcRunRepo=CRepoHandlerFactory.CreateInstall(sPathPythonProg, bForceInstall),
         funcRunDist=CDistHandlerFactory.CreateInstall(sPathPythonProg, bForceInstall),
-        lIncludeRegEx=g_debug_lInstallModules,
+        lIncludeRegEx=lIncRegEx,
         lExcludeRegEx=["image-render-workspace-.+"],
     )