diff --git a/.docker/symfony.conf b/.docker/symfony.conf
index b5229bf6..0d69c00c 100644
--- a/.docker/symfony.conf
+++ b/.docker/symfony.conf
@@ -47,6 +47,7 @@
         PassEnv PROVIDER_REICHELT_ENABLED PROVIDER_REICHELT_CURRENCY PROVIDER_REICHELT_COUNTRY PROVIDER_REICHELT_LANGUAGE PROVIDER_REICHELT_INCLUDE_VAT
         PassEnv PROVIDER_POLLIN_ENABLED
         PassEnv EDA_KICAD_CATEGORY_DEPTH
+        PassEnv SHOW_PART_IMAGE_OVERLAY
 
         # For most configuration files from conf-available/, which are
         # enabled or disabled at a global level, it is possible to
diff --git a/.env b/.env
index 5ffa0a77..886de47f 100644
--- a/.env
+++ b/.env
@@ -306,7 +306,7 @@ FIXER_API_KEY=CHANGEME
 BANNER=""
 
 # Enable the part image overlay which shows name and filename of the picture
-SHOW_PART_IMAGE_OVERLAY=true
+SHOW_PART_IMAGE_OVERLAY=1
 
 APP_ENV=prod
 APP_SECRET=a03498528f5a5fc089273ec9ae5b2849
diff --git a/docs/configuration.md b/docs/configuration.md
index 0ad30a00..b4e5efc4 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -95,6 +95,8 @@ bundled with Part-DB. Set `DATABASE_MYSQL_SSL_VERIFY_CERT` if you want to accept
   particularly for securing and protecting various aspects of your application. It's a secret key that is used for
   cryptographic operations and security measures (session management, CSRF protection, etc..). Therefore this
   value should be handled as confidential data and not shared publicly.
+* `SHOW_PART_IMAGE_OVERLAY`: Set to 0 to disable the part image overlay, which appears if you hover over an image in the
+  part image gallery
 
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