update expr band syntax docstring (#148)

cogeotiff · Feb 23, 2020 · 6b0d4df · 6b0d4df
1 parent 4286e55
commit 6b0d4df
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/rio_tiler/utils.py b/rio_tiler/utils.py
@@ -736,8 +736,8 @@ def expression(sceneid, tile_x, tile_y, tile_z, expr=None, **kwargs):
     tile_z : int
         Mercator tile ZOOM level.
     expr : str, required
-        Expression to apply (e.g '(B5+B4)/(B5-B4)')
-        Band name should start with 'B'.
+        Expression to apply (e.g '(b5+b4)/(b5-b4)')
+        Band name should start with 'b'.
 
     Returns
     -------