diff --git a/include/twn_util.h b/include/twn_util.h
index 14c532c..a528300 100644
--- a/include/twn_util.h
+++ b/include/twn_util.h
@@ -80,9 +80,9 @@ typedef struct TimerElapseSecondsResult {
 } TimerElapseSecondsResult;
 TWN_API TimerElapseSecondsResult timer_elapse_seconds(float seconds_left, float interval);
 
-TWN_API void log_vec2(Vec2 vector, char const *message);
-TWN_API void log_vec3(Vec3 vector, char const *message);
-TWN_API void log_rect(Rect rect, char const *message);
+TWN_API void log_vec2(Vec2 value, char const *identity);
+TWN_API void log_vec3(Vec3 value, char const *identity);
+TWN_API void log_rect(Rect value, char const *identity);
 
 TWN_API void profile_start(char profile[const static 1]);
 TWN_API void profile_end(char profile[const static 1]);
diff --git a/share/twn_api.json b/share/twn_api.json
index 4712de3..478fb2b 100644
--- a/share/twn_api.json
+++ b/share/twn_api.json
@@ -238,6 +238,36 @@
                 { "name": "parameter", "type": "char *" },
                 { "name": "value", "type": "float" }
             ]
+        },
+
+        "log_vec2": {
+            "module": "util",
+            "symbol": "log_vec2",
+            "header": "twn_util.h",
+            "params": [
+                { "name": "value", "type": "Vec2" },
+                { "name": "identity", "type": "char *" }
+            ]
+        },
+
+        "log_vec3": {
+            "module": "util",
+            "symbol": "log_vec3",
+            "header": "twn_util.h",
+            "params": [
+                { "name": "value", "type": "Vec3" },
+                { "name": "identity", "type": "char *" }
+            ]
+        },
+
+        "log_rect": {
+            "module": "util",
+            "symbol": "log_rect",
+            "header": "twn_util.h",
+            "params": [
+                { "name": "value", "type": "Rect" },
+                { "name": "identity", "type": "char *" }
+            ]
         }
     },