diff --git a/changelog/unreleased/zmd-mimetype.md b/changelog/unreleased/zmd-mimetype.md
new file mode 100644
index 0000000000..1ac29c28d8
--- /dev/null
+++ b/changelog/unreleased/zmd-mimetype.md
@@ -0,0 +1,5 @@
+Enhancement: add support for custom CodiMD mimetype
+
+The new mimetype is associated with the `.zmd` file extension.
+
+https://github.com/cs3org/reva/pull/1233
diff --git a/docs/content/en/docs/config/grpc/services/appprovider/_index.md b/docs/content/en/docs/config/grpc/services/appprovider/_index.md
index 69b18917b6..52bed33ef3 100644
--- a/docs/content/en/docs/config/grpc/services/appprovider/_index.md
+++ b/docs/content/en/docs/config/grpc/services/appprovider/_index.md
@@ -9,7 +9,7 @@ description: >
 # _struct: config_
 
 {{% dir name="iopsecret" type="string" default="" %}}
-The iopsecret used to connect to the wopiserver. [[Ref]](https://github.com/cs3org/reva/tree/master/internal/grpc/services/appprovider/appprovider.go#L58)
+The iopsecret used to connect to the wopiserver. [[Ref]](https://github.com/cs3org/reva/tree/master/internal/grpc/services/appprovider/appprovider.go#L62)
 {{< highlight toml >}}
 [grpc.services.appprovider]
 iopsecret = ""
@@ -17,7 +17,7 @@ iopsecret = ""
 {{% /dir %}}
 
 {{% dir name="wopiurl" type="string" default="" %}}
-The wopiserver's URL. [[Ref]](https://github.com/cs3org/reva/tree/master/internal/grpc/services/appprovider/appprovider.go#L59)
+The wopiserver's URL. [[Ref]](https://github.com/cs3org/reva/tree/master/internal/grpc/services/appprovider/appprovider.go#L63)
 {{< highlight toml >}}
 [grpc.services.appprovider]
 wopiurl = ""
diff --git a/examples/ocmd/ocmd-server-1.toml b/examples/ocmd/ocmd-server-1.toml
index 7d4fb4f56b..b37a9b2e62 100644
--- a/examples/ocmd/ocmd-server-1.toml
+++ b/examples/ocmd/ocmd-server-1.toml
@@ -70,12 +70,16 @@ driver = "demo"
 iopsecret = "testsecret"
 wopiurl = "http://0.0.0.0:8880/"
 
+[grpc.services.appprovider.mimetypes]
+".zmd" = "application/compressed-markdown"
+
 [grpc.services.appregistry]
 driver = "static"
 
 [grpc.services.appregistry.static.rules]
 "text/plain" = "localhost:19000"
 "text/markdown" = "localhost:19000"
+"application/compressed-markdown" = "localhost:19000"
 "application/vnd.oasis.opendocument.text" = "localhost:19000"
 "application/vnd.oasis.opendocument.spreadsheet" = "localhost:19000"
 "application/vnd.oasis.opendocument.presentation" = "localhost:19000"
diff --git a/internal/grpc/services/appprovider/appprovider.go b/internal/grpc/services/appprovider/appprovider.go
index a3bc5463bb..2aa825f480 100644
--- a/internal/grpc/services/appprovider/appprovider.go
+++ b/internal/grpc/services/appprovider/appprovider.go
@@ -35,6 +35,7 @@ import (
 	"github.com/cs3org/reva/pkg/app"
 	"github.com/cs3org/reva/pkg/app/provider/demo"
 	"github.com/cs3org/reva/pkg/appctx"
+	"github.com/cs3org/reva/pkg/mime"
 	"github.com/cs3org/reva/pkg/rgrpc"
 	"github.com/cs3org/reva/pkg/rgrpc/status"
 	"github.com/cs3org/reva/pkg/rhttp"
@@ -57,16 +58,18 @@ type config struct {
 	Demo      map[string]interface{} `mapstructure:"demo"`
 	IopSecret string                 `mapstructure:"iopsecret" docs:";The iopsecret used to connect to the wopiserver."`
 	WopiURL   string                 `mapstructure:"wopiurl" docs:";The wopiserver's URL."`
+	MimeTypes map[string]string      `mapstructure:"mimetypes"`
 }
 
 // New creates a new AppProviderService
 func New(m map[string]interface{}, ss *grpc.Server) (rgrpc.Service, error) {
-
 	c, err := parseConfig(m)
 	if err != nil {
 		return nil, err
 	}
 
+	registerMimeTypes(c.MimeTypes)
+
 	provider, err := getProvider(c)
 	if err != nil {
 		return nil, err
@@ -88,6 +91,12 @@ func parseConfig(m map[string]interface{}) (*config, error) {
 	return c, nil
 }
 
+func registerMimeTypes(mimes map[string]string) {
+	for k, v := range mimes {
+		mime.RegisterMime(k, v)
+	}
+}
+
 func (s *service) Close() error {
 	return nil
 }