diff --git a/core/http/endpoints/openai/chat.go b/core/http/endpoints/openai/chat.go
index c7afb7bf95e..86b75601bc4 100644
--- a/core/http/endpoints/openai/chat.go
+++ b/core/http/endpoints/openai/chat.go
@@ -226,12 +226,12 @@ func ChatEndpoint(cl *config.BackendConfigLoader, ml *model.ModelLoader, startup
 
 			// Update input grammar
 			jsStruct := funcs.ToJSONStructure(config.FunctionsConfig.FunctionNameKey, config.FunctionsConfig.FunctionNameKey)
-			g, err := jsStruct.Grammar(config.FunctionsConfig.GrammarConfig.Options()...)
+			g, err := jsStruct.Grammar(config.FunctionsConfig.GrammarOptions()...)
 			if err == nil {
 				config.Grammar = g
 			}
 		case input.JSONFunctionGrammarObject != nil:
-			g, err := input.JSONFunctionGrammarObject.Grammar(config.FunctionsConfig.GrammarConfig.Options()...)
+			g, err := input.JSONFunctionGrammarObject.Grammar(config.FunctionsConfig.GrammarOptions()...)
 			if err == nil {
 				config.Grammar = g
 			}
diff --git a/pkg/functions/parse.go b/pkg/functions/parse.go
index 1c95f2f5300..f5593690a9b 100644
--- a/pkg/functions/parse.go
+++ b/pkg/functions/parse.go
@@ -23,7 +23,9 @@ type GrammarConfig struct {
 	MixedMode bool `yaml:"mixed_mode"`
 
 	// NoMixedFreeString disables the mixed mode for free strings
-	// In this way if the LLM selects a free string, it won't be mixed necessarly with JSON objects
+	// In this way if the LLM selects a free string, it won't be mixed necessarly with JSON objects.
+	// For example, if enabled the LLM or returns a JSON object or a free string, but not a mix of both
+	// If disabled(default): the LLM can return a JSON object surrounded by free strings (e.g. `this is the JSON result: { "bar": "baz" } for your question`). This forces the LLM to return at least a JSON object, but its not going to be strict
 	NoMixedFreeString bool `yaml:"no_mixed_free_string"`
 
 	// NoGrammar disables the grammar parsing and parses the responses directly from the LLM