diff --git a/README.org b/README.org
index 41bda7e..103e7c9 100644
--- a/README.org
+++ b/README.org
@@ -11,8 +11,10 @@ Get the file, add to load path, and
 #+END_SRC
 * Usage
 ** Function
-- =eldoc-box-hover-mode= :: Show documentation upon hover. Note that you need to enable ElDoc mode for this to work.
-- =eldoc-box-hover-at-point-mode= :: This minor mode shows doc at point. Don't try to enable both minor mode: you can only enable one in the same time.
+Enable either mode will make eldoc display documentation on a popup childframe. The difference is the position of the childframe — the first minor mode displays the childframe on (left or right) upper corner, while the second displays the childframe right below point.
+
+- =eldoc-box-hover-mode= :: Display documentation of the symbol at point in a childframe on upper corner.
+- =eldoc-box-hover-at-point-mode= :: Display documentation of the symbol at point in a childframe below point.
 ** Face
 -  =eldoc-box-border= :: Adjust =:background= of this face for border color.
 - =eldoc-box-body= :: Adjust =:background= of  this face for background color of childframe.
diff --git a/screenshot.png b/screenshot.png
index 8e323ee..d029ded 100644
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