diff --git a/docs/src/using.md b/docs/src/using.md
index 82c11ee41..3e5c40567 100644
--- a/docs/src/using.md
+++ b/docs/src/using.md
@@ -2,18 +2,19 @@
 
 Martin data is available via the HTTP `GET` endpoints:
 
-| URL                                     | Description                                    |
-|-----------------------------------------|------------------------------------------------|
-| `/`                                     | Web UI                                         |
-| `/catalog`                              | [List of all sources](#catalog)                |
-| `/{sourceID}`                           | [Source TileJSON](#source-tilejson)            |
-| `/{sourceID}/{z}/{x}/{y}`               | Map Tiles                                      |
-| `/{source1},…,{sourceN}`                | [Composite Source TileJSON](#source-tilejson)  |
-| `/{source1},…,{sourceN}/{z}/{x}/{y}`    | [Composite Source Tiles](sources-composite.md) |
-| `/sprite/{spriteID}[@2x].{json,png}`    | [Sprite sources](sources-sprites.md)           |
-| `/font/{font}/{start}-{end}`            | [Font source](sources-fonts.md)                |
-| `/font/{font1},…,{fontN}/{start}-{end}` | [Composite Font source](sources-fonts.md)      |
-| `/health`                               | Martin server health check: returns 200 `OK`   |
+| URL                                      | Description                                    |
+|------------------------------------------|------------------------------------------------|
+| `/`                                      | Web UI                                         |
+| `/catalog`                               | [List of all sources](#catalog)                |
+| `/{sourceID}`                            | [Source TileJSON](#source-tilejson)            |
+| `/{sourceID}/{z}/{x}/{y}`                | Map Tiles                                      |
+| `/{source1},…,{sourceN}`                 | [Composite Source TileJSON](#source-tilejson)  |
+| `/{source1},…,{sourceN}/{z}/{x}/{y}`     | [Composite Source Tiles](sources-composite.md) |
+| `/sprite/{spriteID}[@2x].{json,png}`     | [Sprite sources](sources-sprites.md)           |
+| `/sdf_sprite/{spriteID}[@2x].{json,png}` | [SDF Sprite sources](sources-sprites.md)       |
+| `/font/{font}/{start}-{end}`             | [Font source](sources-fonts.md)                |
+| `/font/{font1},…,{fontN}/{start}-{end}`  | [Composite Font source](sources-fonts.md)      |
+| `/health`                                | Martin server health check: returns 200 `OK`   |
 
 ### Duplicate Source ID