diff --git a/docs/content/pages/iblog.md b/docs/content/pages/iblog.md
index 771fb474..82a9de5d 100644
--- a/docs/content/pages/iblog.md
+++ b/docs/content/pages/iblog.md
@@ -15,9 +15,14 @@ http://www.scala-lang.org/.
 
 # Introduction
 
-Start the BLOG interactive shell using the `iblog` command. In the examples
-below, lines prefixed with `scala>` are what you type into the shell. Lines
-without that prefix are output printed by the shell.
+Start the BLOG interactive shell using the `iblog` command. You could change the maximum Java heap size by typing `iblog -J-Xmx<The maximum Java heap size you want>`. For example, if you type
+
+```text
+iblog -J-Xmx1024M
+```
+
+Then the maximum Java heap size will be set to 1024M.
+In the examples below, lines prefixed with `scala>` are what you type into the shell. Lines without that prefix are output printed by the shell.
 
 
 # Example: Debugging Likelihood Weighting
diff --git a/iblog.bat b/iblog.bat
index 4fc34709..38b26644 100644
--- a/iblog.bat
+++ b/iblog.bat
@@ -1,13 +1,17 @@
 @echo off
-if "%1"=="" set JAVA_OPTS=-Xmx4096M
+set Param1=%1
+if "%Param1:~0,6%"=="-J-Xmx" (
+  set JAVA_OPTS=%Param1:~2%
+  set Param1=
+)
 set BLOG_HOME=%~dp0..
 echo Starting Interative Shell for BLOG
 if exist "%BLOG_HOME%\bin\iblog.scala" (
   set CPATH="%BLOG_HOME%\lib\java-cup-11b.jar;%BLOG_HOME%\lib\*"
-  scala -cp %CPATH% -i "%BLOG_HOME%\bin\iblog.scala" -J%JAVA_OPTS% %*
+  scala -cp %CPATH% -i "%BLOG_HOME%\bin\iblog.scala" -J%JAVA_OPTS% %Param1% %2 %3 %4 %5 %6 %7 %8 %9
 ) else (
   set BLOG_DEVELOP_HOME=%~dp0
 	if NOT exist "%BLOG_DEVELOP_HOME%target\universal\stage\" (sbt\sbt.bat stage)
   set CPATH="%BLOG_DEVELOP_HOME%target\universal\stage\lib\java-cup-11b.jar;%BLOG_DEVELOP_HOME%target\universal\stage\lib\*"
-  scala -cp %CPATH% -i "%BLOG_DEVELOP_HOME%src\main\scala\iblog.scala" -J%JAVA_OPTS% %*
+  scala -cp %CPATH% -i "%BLOG_DEVELOP_HOME%src\main\scala\iblog.scala" -J%JAVA_OPTS% %Param1% %2 %3 %4 %5 %6 %7 %8 %9
 )