diff --git a/ggplot/geoms/geom_bar.py b/ggplot/geoms/geom_bar.py
index 07a62fdd..f8dc6245 100755
--- a/ggplot/geoms/geom_bar.py
+++ b/ggplot/geoms/geom_bar.py
@@ -11,6 +11,8 @@ class geom_bar(geom):
     ----------
     x:
         x values for bins/categories
+    weight:
+        heights of the bars
     color:
         color of the outer line
     alpha: