diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80b55c6..f1c8455 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Changelog
 
+### 0.4.10
+
+* Updated reference.json
+
 ### 0.4.9
 
 * Render TileJSON, Mapnik options to Mapnik XML parameters.
diff --git a/lib/carto/tree/reference.json b/lib/carto/tree/reference.json
index 099c59e..7836ad3 100644
--- a/lib/carto/tree/reference.json
+++ b/lib/carto/tree/reference.json
@@ -131,6 +131,15 @@
                 "default-value": 1,
                 "default-meaning": "opaque"
             },
+            "smooth": {
+                "css": "polygon-smooth",
+                "api": "smooth",
+                "type": "float",
+                "default-value": 0,
+                "default-meaning": "no smoothing",
+                "range": "0-1",
+                "doc": "Amount of smoothing applied"
+            },
             "meta-output": {
                 "css": "polygon-meta-output",
                 "type": "string",
@@ -208,6 +217,15 @@
                 "default-value": "none",
                 "default-meaning": "solid line"
             },
+            "smooth": {
+                "css": "line-smooth",
+                "api": "smooth",
+                "type": "float",
+                "default-value": 0,
+                "default-meaning": "no smoothing",
+                "range": "0-1",
+                "doc": "Amount of smoothing applied"
+            },
             "meta-output": {
                 "css": "line-meta-output",
                 "type": "string",
diff --git a/package.json b/package.json
index 842d92d..1c068f6 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "Konstantin Käfer",
     "Alexis Sellier <self@cloudhead.net>"
   ],
-  "version": "0.4.9",
+  "version": "0.4.10",
   "licenses": [{
     "type": "Apache"
   }],