diff --git a/README.md b/README.md
index 1226e7b..0abd83f 100644
--- a/README.md
+++ b/README.md
@@ -110,6 +110,29 @@ $ tippecanoe -o alameda.mbtiles -l alameda -n "Alameda County from TIGER" -z13 t
 $ cat tiger/tl_2014_*_roads.json | tippecanoe -o tiger.mbtiles -l roads -n "All TIGER roads, one zoom" -z12 -Z12 -d14 -x LINEARID -x RTTYP
 ```
 
+GeoJSON extension
+-----------------
+
+Tippecanoe defines a GeoJSON extension that you can use to specify the minimum and/or maximum zoom level
+at which an individual feature will be included in the vector tile dataset being produced.
+If you have a feature like this:
+
+```
+{
+    "type" : "Feature",
+    "tippecanoe" : { "maxzoom" : 9, "minzoom" : 4 },
+    "properties" : { "FULLNAME" : "N Vasco Rd", },
+    "geometry" : {
+	"type" : "LineString",
+	"coordinates" : [ ...  ]
+    }
+}
+```
+
+with a `tippecanoe` object specifiying a `maxzoom` of 9 and a `minzoom` of 4, the feature
+will only appear in the vector tiles for zoom levels 4 through 9. Note that the `tippecanoe`
+object belongs to the Feature, not to its `properties`.
+
 Point styling
 -------------
 
diff --git a/geojson.c b/geojson.c
index 40edc40..4938f04 100644
--- a/geojson.c
+++ b/geojson.c
@@ -451,11 +451,17 @@ int serialize_geometry(json_object *geometry, json_object *properties, const cha
 		if (min != NULL && min->type == JSON_NUMBER) {
 			tippecanoe_minzoom = min->number;
 		}
+		if (min != NULL && min->type == JSON_STRING) {
+			tippecanoe_minzoom = atoi(min->string);
+		}
 
 		json_object *max = json_hash_get(tippecanoe, "maxzoom");
 		if (max != NULL && max->type == JSON_NUMBER) {
 			tippecanoe_maxzoom = max->number;
 		}
+		if (max != NULL && max->type == JSON_STRING) {
+			tippecanoe_maxzoom = atoi(max->string);
+		}
 	}
 
 	unsigned bbox[] = {UINT_MAX, UINT_MAX, 0, 0};
diff --git a/man/tippecanoe.1 b/man/tippecanoe.1
index 72322df..b216590 100644
--- a/man/tippecanoe.1
+++ b/man/tippecanoe.1
@@ -137,6 +137,29 @@ $ tippecanoe \-o alameda.mbtiles \-l alameda \-n "Alameda County from TIGER" \-z
 $ cat tiger/tl_2014_*_roads.json | tippecanoe \-o tiger.mbtiles \-l roads \-n "All TIGER roads, one zoom" \-z12 \-Z12 \-d14 \-x LINEARID \-x RTTYP
 .fi
 .RE
+.SH GeoJSON extension
+.PP
+Tippecanoe defines a GeoJSON extension that you can use to specify the minimum and/or maximum zoom level
+at which an individual feature will be included in the vector tile dataset being produced.
+If you have a feature like this:
+.PP
+.RS
+.nf
+{
+    "type" : "Feature",
+    "tippecanoe" : { "maxzoom" : 9, "minzoom" : 4 },
+    "properties" : { "FULLNAME" : "N Vasco Rd", },
+    "geometry" : {
+    "type" : "LineString",
+    "coordinates" : [ ...  ]
+    }
+}
+.fi
+.RE
+.PP
+with a \fB\fCtippecanoe\fR object specifiying a \fB\fCmaxzoom\fR of 9 and a \fB\fCminzoom\fR of 4, the feature
+will only appear in the vector tiles for zoom levels 4 through 9. Note that the \fB\fCtippecanoe\fR
+object belongs to the Feature, not to its \fB\fCproperties\fR\&.
 .SH Point styling
 .PP
 To provide a consistent density gradient as you zoom, the Mapbox Studio style needs to be