diff --git a/src/api/AnnotationPostProcessor.java b/src/api/AnnotationPostProcessor.java
new file mode 100644
index 00000000..0de6cb3a
--- /dev/null
+++ b/src/api/AnnotationPostProcessor.java
@@ -0,0 +1,20 @@
+
+package api;
+
+import io.swagger.v3.jaxrs2.Reader;
+import io.swagger.v3.jaxrs2.ReaderListener;
+import io.swagger.v3.oas.models.OpenAPI;
+
+public class AnnotationPostProcessor implements ReaderListener {
+
+	@Override
+	public void beforeScan(Reader reader, OpenAPI openAPI) {}
+
+	@Override
+	public void afterScan(Reader reader, OpenAPI openAPI) {
+		// TODO: use context path and keys from "x-translation" extension annotations
+		// to translate "descriptions" and finally remove "x-translation" extensions
+		// from output.
+	}
+	
+}
diff --git a/src/api/ApiService.java b/src/api/ApiService.java
index afa236ec..9e3c5012 100644
--- a/src/api/ApiService.java
+++ b/src/api/ApiService.java
@@ -23,8 +23,9 @@ public class ApiService {
 		this.resources = new HashSet<Class<?>>();
 		this.resources.add(BlocksResource.class);
 		this.resources.add(OpenApiResource.class); // swagger
+		this.resources.add(AnnotationPostProcessor.class); // for API resource annotations
 		ResourceConfig config = new ResourceConfig(this.resources);
-
+		
 		// create RPC server
 		this.server = new Server(Settings.getInstance().getRpcPort());
 
diff --git a/src/api/BlocksResource.java b/src/api/BlocksResource.java
index de4a30e9..37c2d2a8 100644
--- a/src/api/BlocksResource.java
+++ b/src/api/BlocksResource.java
@@ -1,7 +1,10 @@
 package api;
 
 import globalization.Translator;
+import io.swagger.v3.oas.annotations.OpenAPIDefinition;
 import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.extensions.Extension;
+import io.swagger.v3.oas.annotations.extensions.ExtensionProperty;
 import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.media.Schema;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
@@ -19,6 +22,11 @@ import repository.RepositoryManager;
 
 @Path("blocks")
 @Produces({MediaType.APPLICATION_JSON, MediaType.TEXT_PLAIN})
+@OpenAPIDefinition(
+	extensions = @Extension(name = "translation", properties = {
+		@ExtensionProperty(name="path", value="/BlocksResource"),
+	})
+)
 public class BlocksResource {
 
 	@Context
@@ -37,6 +45,10 @@ public class BlocksResource {
 	@GET
 	@Operation(
 		description = "Returns an array of the 50 last blocks generated by your accounts",
+		extensions = @Extension(name = "translation", properties = {
+			@ExtensionProperty(name="path", value="getBlocks"),
+			@ExtensionProperty(name="key", value="description")
+		}),
 		responses = {
 			@ApiResponse(
 				description = "The blocks"
@@ -45,6 +57,9 @@ public class BlocksResource {
 			@ApiResponse(
 				responseCode = "422",
 				description = "Error: 201 - Wallet does not exist",
+				extensions = @Extension(name = "translation", properties = {
+					@ExtensionProperty(name="key", value="ApiError/201")
+				}),
 				content = @Content(schema = @Schema(implementation = ApiErrorMessage.class))
 			)
 		}