diff --git a/images/docker-calibre.md b/images/docker-calibre.md
index 7608650b8..ddfe56475 100644
--- a/images/docker-calibre.md
+++ b/images/docker-calibre.md
@@ -40,6 +40,7 @@ docker create \
   -e TZ=Europe/London \
   -e GUAC_USER=abc `#optional` \
   -e GUAC_PASS=900150983cd24fb0d6963f7d28e17f72 `#optional` \
+  -e UMASK_SET=022 `#optional` \
   -p 8080:8080 \
   -p 8081:8081 \
   -v /path/to/data:/config \
@@ -65,6 +66,7 @@ services:
       - TZ=Europe/London
       - GUAC_USER=abc #optional
       - GUAC_PASS=900150983cd24fb0d6963f7d28e17f72 #optional
+      - UMASK_SET=022 #optional
     volumes:
       - /path/to/data:/config
     ports:
@@ -94,6 +96,7 @@ Docker images are configured using parameters passed at runtime (such as those a
 | `TZ=Europe/London` | Specify a timezone to use EG Europe/London. |
 | `GUAC_USER=abc` | Username for the calibre desktop gui. |
 | `GUAC_PASS=900150983cd24fb0d6963f7d28e17f72` | Password's md5 hash for the calibre desktop gui. |
+| `UMASK_SET=022` | for umask setting of Calibre, default if left unset is 022. |
 
 ### Volume Mappings (`-v`)
 
@@ -149,6 +152,7 @@ You can access advanced features of the Guacamole remote desktop using `ctrl`+`a
 
 ## Versions
 
+* **18.03.19:** - Let Calibre access environment variables, add optional umask setting.
 * **23.10.19:** - Remove reccomended deps and zenity for character compatibility.
 * **18.10.19:** - Add python-xdg.
 * **08.10.19:** - Add fonts-wqy-microhei ttf-wqy-zenhei fcitx-rime dependency to resolve issue with Chinese encoding.