diff --git a/Dockerfile b/Dockerfile
index 692609d..66df25a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM java:8-jdk-alpine
+FROM openjdk:8-jdk-alpine
 
 RUN apk add --no-cache --update python3 git
 
diff --git a/README.md b/README.md
index 2935e77..455a2b0 100644
--- a/README.md
+++ b/README.md
@@ -118,7 +118,7 @@ A more thorough instruction in using Docker to produce the results can be found
 There exists a *Dockerfile* in the repository. It contains all the steps in chronological order that is needed to generate the `fix_and_bug_introducing_pairs.json`. Simply run this command in the directory where the Dockerfile is located:
 
 ```bash
-docker build -t ssz .
+docker build -t szz .
 ```
 
 Then start a temporary docker container:
diff --git a/doc/Docker.md b/doc/Docker.md
index 8606edf..360362c 100644
--- a/doc/Docker.md
+++ b/doc/Docker.md
@@ -28,7 +28,7 @@ docker run -it --name ssz_con szz ash
 cd /root/fetch_jira_bugs
 python3 fetch.py --issue-code JENKINS --jira-project issues.jenkins-ci.org
 python3 git_log_to_array.py --repo-path ../jenkins --from-commit 02d6908ada70fcf8012833ddef628bc09c6f8389
-python3 find_bug_fixes.py --gitlog ./gitlog.json --issue-list ./issues
+python3 find_bug_fixes.py --gitlog ./gitlog.json --issue-list ./issues --gitlog-pattern "JENKINS-{nbr}\D|#{nbr}\D|HUDSON-{nbr}\D"
 cd /root/szz
 java -jar ./build/libs/szz_find_bug_introducers-0.1.jar -i ../fetch_jira_bugs/issue_list.json -r ../jenkins
 ```
diff --git a/fetch_jira_bugs/find_bug_fixes.py b/fetch_jira_bugs/find_bug_fixes.py
index e532336..a23a0b4 100644
--- a/fetch_jira_bugs/find_bug_fixes.py
+++ b/fetch_jira_bugs/find_bug_fixes.py
@@ -99,13 +99,19 @@ def main():
                                                     the issue directory is created and populated using
                                                     the fetch.py script.""")
     parser.add_argument('--gitlog', type=str,
-                        help='Path to json file containing gitlog')
+                        help='Path to json file containing gitlog', 
+                        required = True)
     parser.add_argument('--issue-list', type=str,
-                        help='Path to directory containing issue json files')
+                        help='Path to directory containing issue json files', 
+                        required = True)
     parser.add_argument('--gitlog-pattern', type=str,
-                        help='Pattern to match a bugfix')
+                        help='Pattern to match a bugfix', 
+                        required = True)
     args = parser.parse_args()
 
+    # display gitlog_pattern to the console
+    print('Confirming gitlog_pattern: ' + args.gitlog_pattern)
+
     issue_list = find_bug_fixes(args.issue_list, args.gitlog, args.gitlog_pattern)
     with open('issue_list.json', 'w') as f:
         f.write(json.dumps(issue_list))