Docer compose syntax limitations

Author: btardif

articles/app-service/configure-custom-container.md

@@ -495,11 +495,20 @@ The following lists show supported and unsupported Docker Compose configuration
 - secrets (ignored)
 - ports other than 80 and 8080 (ignored)
 
+#### Syntax Limitations
+
+- the "version x.x" always needs to be the first yaml statement in the file
+- the ports section must use quoted numbers
+- the image > volume section must be quoted and cannot have a permissions definitions
+- the volumes section must not have an empty curly brace after the volume name
+
 > [!NOTE]
 > Any other options not explicitly called out are ignored in Public Preview.
 
 [!INCLUDE [robots933456](../../includes/app-service-web-configure-robots933456.md)]
 
+
+
 ::: zone-end
 
 ## Next steps