diff --git a/git-now b/git-now
old mode 100644
new mode 100755
index 8a7158b..03c5207
--- a/git-now
+++ b/git-now
@@ -5,30 +5,48 @@ MESSAGE="[${PREFIX}] `date +\"%Y/%m/%d %T\"`"
 
 if [ $# -eq 0 ]
 then
-    git add -u
-    printf "${MESSAGE}\n\n%s" "`git diff --cached`" | git commit -F -
+  git add -u
+  printf "${MESSAGE}\n\n%s" "`git diff --cached`" | git commit -F -
 elif [ $1 != "--rebase" ]
 then
-    if [ $1 != "--all" ]
-    then
-        git add $@
-    else
-        git add -u
-        git add .
-    fi
-    printf "${MESSAGE}\n\n%s" "`git diff --cached`" | git commit -F -
+  if [ $1 != "--all" ]
+  then
+    git add $@
+  else
+    git add -u
+    git add .
+  fi
+  printf "${MESSAGE}\n\n%s" "`git diff --cached`" | git commit -F -
 else
+  if [ $# -eq 1 ]
+  then
     FIRST_NOW_COMMIT=`git log --pretty=oneline --grep="${PREFIX}" | tail -n 1 | cut -d " " -f 1`
     INITIAL_COMMIT=`git log --pretty=oneline | tail -n 1 | cut -d " " -f 1`
 
     if [ ${FIRST_NOW_COMMIT} != ${INITIAL_COMMIT} ]
     then
-        git rebase -i ${FIRST_NOW_COMMIT}^
+      git rebase -i ${FIRST_NOW_COMMIT}^
     else
-        WORKING_BRANCH=`git branch -l | grep "*" | cut -d " " -f 2`
+      WORKING_BRANCH=`git branch -l | grep "*" | cut -d " " -f 2`
 
-        git checkout ${FIRST_NOW_COMMIT}
-        git commit --amend
-        git rebase --onto HEAD ${FIRST_NOW_COMMIT} ${WORKING_BRANCH}
+      git checkout ${FIRST_NOW_COMMIT}
+      git commit --amend
+      git rebase --onto HEAD ${FIRST_NOW_COMMIT} ${WORKING_BRANCH}
     fi
+  else
+    BASE_BRANCH=$2
+    WORKING_BRANCH=`git branch -l | grep "*" | cut -d " " -f 2`
+    COMMON_ANCESTOR_COMMIT=`git merge-base ${BASE_BRANCH} ${WORKING_BRANCH}`
+    FIRST_NOW_COMMIT=`git log ${COMMON_ANCESTOR_COMMIT}.. --pretty=oneline --grep="${PREFIX}" | tail -n 1 | cut -d " " -f 1`
+    INITIAL_COMMIT=`git log --pretty=oneline | tail -n 1 | cut -d " " -f 1`
+
+    if [ ${FIRST_NOW_COMMIT} != ${INITIAL_COMMIT} ]
+    then
+      git rebase -i ${FIRST_NOW_COMMIT}^
+    else
+      git checkout ${FIRST_NOW_COMMIT}
+      git commit --amend
+      git rebase --onto HEAD ${FIRST_NOW_COMMIT} ${WORKING_BRANCH}
+    fi
+  fi
 fi