diff --git a/README.org b/README.org
index 6f66985..83e249f 100644
--- a/README.org
+++ b/README.org
@@ -14,6 +14,7 @@ Get the file, add to load path, and
 -  =eldoc-box-border= :: Adjust =:background= of this face for border color.
 - =eldoc-box-body= :: Adjust =:background= of  this face for background color of childframe.
 ** Variable
+- =eldoc-box-max-pixel-width= & =eldoc-box-max-pixel-height= :: Set them according to the screen resolution of your machine.
 - =eldoc-box-only-multi-line= :: Set this to non-nil and eldoc-box only display multi-line message in childframe. One line messages are left in minibuffer.
 
 ** Use with eglot
diff --git a/eldoc-box.el b/eldoc-box.el
index 267123a..02b8211 100644
--- a/eldoc-box.el
+++ b/eldoc-box.el
@@ -84,9 +84,12 @@
   "Frame parameters used to create the frame.")
 
 (defvar eldoc-box-max-pixel-width 800
-  "Maximum width of doc childframw in pixel.")
-(defvar eldoc-box-max-pixel-height 1400
-  "Maximum height of doc childframw in pixel.")
+  "Maximum width of doc childframw in pixel.
+Consider your machine's screen's resolution when setting this variable.")
+
+(defvar eldoc-box-max-pixel-height 700
+  "Maximum height of doc childframw in pixel.
+Consider your machine's screen's resolution when setting this variable.")
 
 ;;;;; Function