diff --git a/.github/workflows/validate/validate.sh b/.github/workflows/validate/validate.sh
index b918a29e..412fd9c0 100755
--- a/.github/workflows/validate/validate.sh
+++ b/.github/workflows/validate/validate.sh
@@ -28,10 +28,16 @@ while read image; do
 
     # Extract properties into variables
     filename=$(basename "${image}")
+    folderpath=$(dirname "${image}")
+    foldername=$(basename "${folderpath}")
     width="${properties[0]}"
     height="${properties[1]}"
     type="${properties[2]}"
 
+    # Underscore folders are special cases. Instead one should symlink between integration domains
+    [[ "${foldername}" == _* && "${foldername}" != "_placeholder" && "${foldername}" != "_homeassistant" ]] \
+      && error "${folderpath}" "Directories should not start with an underscore (_), please use the integration domain instead"
+
     # Ensure file is actually a PNG file
     [[ "${type}" != "PNG" ]] \
       && error "${image}" "Invalid file type '${type}' for file"
diff --git a/README.md b/README.md
index 93b1f33f..c19cdc88 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,13 @@ symlinking domain folders for the same icon/logos is allowed. The deployment
 process at our hosting provider will unpack these symlinks to actual files
 during the deployment process.
 
+Please note, symlinks should only be created between integration domain
+directories. The `_placeholder` & `_homeassistant` directories are special
+cases and new directories with an underscore (`_`) should not be created.
+
+The names of directories must always match the integration domain. Additional
+directories are not allowed.
+
 ## Trademark Legal Notices
 
 All product names, trademarks and registered trademarks in the images in this