diff --git a/src/Serval.Client/Client.g.cs b/src/Serval.Client/Client.g.cs
index 02de8cdf..bfd1ff8e 100644
--- a/src/Serval.Client/Client.g.cs
+++ b/src/Serval.Client/Client.g.cs
@@ -4317,6 +4317,9 @@ public partial class TranslationBuild
         [Newtonsoft.Json.JsonProperty("dateFinished", Required = Newtonsoft.Json.Required.Default, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
         public System.DateTimeOffset? DateFinished { get; set; } = default!;
 
+        [Newtonsoft.Json.JsonProperty("options", Required = Newtonsoft.Json.Required.Default, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
+        public string? Options { get; set; } = default!;
+
     }
 
     [System.CodeDom.Compiler.GeneratedCode("NJsonSchema", "13.18.2.0 (NJsonSchema v10.8.0.0 (Newtonsoft.Json v13.0.0.0))")]
@@ -4358,6 +4361,9 @@ public partial class TranslationBuildConfig
         [Newtonsoft.Json.JsonProperty("pretranslate", Required = Newtonsoft.Json.Required.Default, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
         public System.Collections.Generic.IList<PretranslateCorpusConfig>? Pretranslate { get; set; } = default!;
 
+        [Newtonsoft.Json.JsonProperty("options", Required = Newtonsoft.Json.Required.Default, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
+        public string? Options { get; set; } = default!;
+
     }
 
     [System.CodeDom.Compiler.GeneratedCode("NJsonSchema", "13.18.2.0 (NJsonSchema v10.8.0.0 (Newtonsoft.Json v13.0.0.0))")]
diff --git a/src/Serval.Grpc/Protos/serval/translation/v1/engine.proto b/src/Serval.Grpc/Protos/serval/translation/v1/engine.proto
index b5d37d37..c0cb37f0 100644
--- a/src/Serval.Grpc/Protos/serval/translation/v1/engine.proto
+++ b/src/Serval.Grpc/Protos/serval/translation/v1/engine.proto
@@ -60,7 +60,8 @@ message StartBuildRequest {
     string engine_type = 1;
     string engine_id = 2;
     string build_id = 3;
-    repeated Corpus corpora = 4;
+    string options = 4;
+    repeated Corpus corpora = 5;
 }
 
 message CancelBuildRequest {
diff --git a/src/Serval.Translation/Contracts/TranslationBuildConfigDto.cs b/src/Serval.Translation/Contracts/TranslationBuildConfigDto.cs
index 41e81af9..9ff97076 100644
--- a/src/Serval.Translation/Contracts/TranslationBuildConfigDto.cs
+++ b/src/Serval.Translation/Contracts/TranslationBuildConfigDto.cs
@@ -1,6 +1,10 @@
-namespace Serval.Translation.Contracts;
+using System.Text.Json.Nodes;
+
+namespace Serval.Translation.Contracts;
 
 public class TranslationBuildConfigDto
 {
     public IList<PretranslateCorpusConfigDto>? Pretranslate { get; set; }
+
+    public string? Options { get; set; }
 }
diff --git a/src/Serval.Translation/Contracts/TranslationBuildDto.cs b/src/Serval.Translation/Contracts/TranslationBuildDto.cs
index 1bf34c54..9a34bcfc 100644
--- a/src/Serval.Translation/Contracts/TranslationBuildDto.cs
+++ b/src/Serval.Translation/Contracts/TranslationBuildDto.cs
@@ -16,4 +16,5 @@ public class TranslationBuildDto
     /// </summary>
     public JobState State { get; set; }
     public DateTime? DateFinished { get; set; }
+    public string? Options { get; set; }
 }
diff --git a/src/Serval.Translation/Controllers/TranslationEnginesController.cs b/src/Serval.Translation/Controllers/TranslationEnginesController.cs
index 8507a721..33d505e4 100644
--- a/src/Serval.Translation/Controllers/TranslationEnginesController.cs
+++ b/src/Serval.Translation/Controllers/TranslationEnginesController.cs
@@ -1,4 +1,6 @@
-namespace Serval.Translation.Controllers;
+using System.Text.Json;
+
+namespace Serval.Translation.Controllers;
 
 [ApiVersion(1.0)]
 [Route("api/v{version:apiVersion}/translation/engines")]
@@ -784,6 +786,10 @@ CancellationToken cancellationToken
         {
             return BadRequest(ioe.Message);
         }
+        catch (ArgumentException ae)
+        {
+            return BadRequest(ae.Message);
+        }
         if (!await _engineService.StartBuildAsync(build, cancellationToken))
             return NotFound();
 
@@ -976,6 +982,15 @@ private static Build Map(Engine engine, TranslationBuildConfigDto source)
             }
             build.Pretranslate = pretranslateCorpora;
         }
+        try
+        {
+            JsonSerializer.Deserialize<JsonObject>(source.Options ?? "{}");
+        }
+        catch (Exception e)
+        {
+            throw new ArgumentException($"Unable to parse field 'options' : {e.Message}");
+        }
+        build.Options = source.Options;
         return build;
     }
 
@@ -1013,7 +1028,8 @@ private TranslationBuildDto Map(Build source)
             PercentCompleted = source.PercentCompleted,
             Message = source.Message,
             State = source.State,
-            DateFinished = source.DateFinished
+            DateFinished = source.DateFinished,
+            Options = source.Options
         };
     }
 
diff --git a/src/Serval.Translation/Models/Build.cs b/src/Serval.Translation/Models/Build.cs
index ac6cb7fa..3d7f8986 100644
--- a/src/Serval.Translation/Models/Build.cs
+++ b/src/Serval.Translation/Models/Build.cs
@@ -11,4 +11,5 @@ public class Build : IEntity
     public string? Message { get; set; }
     public JobState State { get; set; } = JobState.Pending;
     public DateTime? DateFinished { get; set; }
+    public string? Options { get; set; }
 }
diff --git a/src/Serval.Translation/Services/EngineService.cs b/src/Serval.Translation/Services/EngineService.cs
index 8c55dfab..c0acaea6 100644
--- a/src/Serval.Translation/Services/EngineService.cs
+++ b/src/Serval.Translation/Services/EngineService.cs
@@ -197,6 +197,7 @@ public async Task<bool> StartBuildAsync(Build build, CancellationToken cancellat
                 EngineType = engine.Type,
                 EngineId = engine.Id,
                 BuildId = build.Id,
+                Options = build.Options,
                 Corpora =
                 {
                     engine.Corpora.Select(c =>
diff --git a/src/Serval.Translation/Usings.cs b/src/Serval.Translation/Usings.cs
index 41550d03..2129040f 100644
--- a/src/Serval.Translation/Usings.cs
+++ b/src/Serval.Translation/Usings.cs
@@ -1,5 +1,6 @@
 global using System.Diagnostics.CodeAnalysis;
 global using System.Linq.Expressions;
+global using System.Text.Json.Nodes;
 global using Asp.Versioning;
 global using Grpc.Core;
 global using Grpc.Net.ClientFactory;