diff --git a/src/app/main.ts b/src/app/main.ts
index b8d05fc..1bb3bb2 100644
--- a/src/app/main.ts
+++ b/src/app/main.ts
@@ -1,5 +1,5 @@
 import { Context } from "../lib/github/types";
-import { addRepoCommentsToGH } from "../lib";
+import { addRepoCommentsToGH, addCommentsToGHonInstall } from "../lib";
 
 module.exports = app => {
   app.log("Cheers, the app runs on a server!");
@@ -7,4 +7,8 @@ module.exports = app => {
   app.on("push", async (context: Context) => {
     addRepoCommentsToGH(context);
   });
+
+  app.on("installation", async (context: Context) => {
+    addCommentsToGHonInstall(context);
+  });
 };
diff --git a/src/lib/github/changedFilesList.ts b/src/lib/github/changedFilesList.ts
index a082ed1..b80db8f 100644
--- a/src/lib/github/changedFilesList.ts
+++ b/src/lib/github/changedFilesList.ts
@@ -1,16 +1,9 @@
 /**
  * Gets files that have changed during a commit
  */
-import { Context } from "./types";
+import { Context, ModifiedFile } from "./types";
 import { getBasicRepoProps } from "./utils";
 
-export interface ModifiedFile {
-  name: string;
-  downloadUrl: string;
-  htmlUrl: string;
-  author: string;
-}
-
 export default async function getChangedFiles(context: Context): Promise<ModifiedFile[]> {
   const { owner, repo } = getBasicRepoProps (context);
   const sha = context.payload.head_commit.id;
@@ -25,11 +18,11 @@ export default async function getChangedFiles(context: Context): Promise<Modifie
   const modifiedFiles: Array<Promise<ModifiedFile>> =
     result.data.files.map(async(file) => {
       const name = file.filename;
-      const content = await octokit.repos.getContent({owner, repo, path: name});
+      const content = await octokit.repos.getContents({owner, repo, path: name});
       return {
         name,
-        htmlUrl: content.data.html_url,
-        downloadUrl: content.data.download_url,
+        htmlUrl: content.html_url,
+        downloadUrl: content.download_url,
         author
       };
     });
diff --git a/src/lib/github/getFilesContent.ts b/src/lib/github/getFilesContent.ts
index dc7a986..e296ee8 100644
--- a/src/lib/github/getFilesContent.ts
+++ b/src/lib/github/getFilesContent.ts
@@ -1,5 +1,5 @@
 import fetch from "node-fetch";
-import { ModifiedFile } from "./changedFilesList";
+import { ModifiedFile } from "./types";
 
 export interface FilesContent {
     content: string;
diff --git a/src/lib/github/getFilesOnInstall.ts b/src/lib/github/getFilesOnInstall.ts
new file mode 100644
index 0000000..d6ac7bb
--- /dev/null
+++ b/src/lib/github/getFilesOnInstall.ts
@@ -0,0 +1,26 @@
+/**
+ * Gets files that have changed in the last  commits
+ */
+import { Context, ModifiedFile, File } from "./types";
+import { getBasicRepoProps,  getfileName } from "./utils";
+
+export default async function getFiles(context: Context): Promise<ModifiedFile[]> {
+  const { owner, repo } = getBasicRepoProps (context);
+  const sha = context.payload.head_commit.id;
+  const octokit = context.github;
+  const treeObject = await octokit.gitdata.getTree({owner, repo, sha, recursive: 5});
+  const filePromises: Array<Promise<File>> =  treeObject.tree.map( async (obj) => {
+    return getfileName(octokit, owner, repo, obj.sha);
+  });
+  const arrFile = await Promise.all(filePromises);
+  const modifiedFiles: Array<Promise<ModifiedFile>> = arrFile.map( async (objFile: File) => {
+    const content = await octokit.repos.getContents({owner, repo, path: objFile.name});
+    return {
+      name: objFile.name,
+      htmlUrl: content.html_url,
+      downloadUrl: content.download_url,
+      author: owner
+    };
+  });
+  return Promise.all(modifiedFiles);
+}
diff --git a/src/lib/github/types.ts b/src/lib/github/types.ts
index 8173470..8f6cb9e 100644
--- a/src/lib/github/types.ts
+++ b/src/lib/github/types.ts
@@ -22,3 +22,15 @@ export interface GHIssue {
   number: number;
   title: string;
 }
+
+export interface ModifiedFile {
+  name: string;
+  downloadUrl: string;
+  htmlUrl: string;
+  author: string;
+}
+
+export interface File {
+  name: string;
+  downloadUrl: string;
+}
diff --git a/src/lib/github/utils.ts b/src/lib/github/utils.ts
index 41d44e9..5ee4b72 100644
--- a/src/lib/github/utils.ts
+++ b/src/lib/github/utils.ts
@@ -3,10 +3,9 @@
  */
 import { groupBy, flatten, prop } from "ramda";
 
-import { Context, Issue, RepoProps, GHIssue } from "./types";
+import { Context, Issue, RepoProps, GHIssue, ModifiedFile, File } from "./types";
 import { RepoIssue } from "../parser";
 
-
 export function getBasicRepoProps (context: Context): RepoProps {
   const owner = context.payload.repository.owner.login;
   const repo = context.payload.repository.name;
@@ -45,3 +44,29 @@ export function mergeFileRepoIssues(repoIssues: RepoIssue[][]): RepoIssue[] {
       Object.keys(groupedByIssueType).map(key => groupedByIssueType[key]);
   return flatten<RepoIssue>(issueGroupsList);
 }
+
+export function getModifiedFiles(octokit, array, owner, repo): Promise<ModifiedFile[]> {
+  const modifiedFiles: Array<Promise<ModifiedFile>> = array.data.files.map(async(file) => {
+  const name = file.filename;
+  const content = await octokit.repos.getContent({owner, repo, path: name});
+  return { name, htmlUrl: content.data.html_url, downloadUrl: content.data.download_url};
+});
+  return Promise.all(modifiedFiles);
+}
+
+export async function getfileName(
+  octokit,
+  owner: string,
+  repo: string,
+  sha: string
+): Promise<File> {
+ const objFiles = await octokit.gitdata.getTree({owner, repo, sha});
+ if (!objFiles) return;
+ return objFiles.tree.map( async (obj) => {
+  if (obj.type !== "tree") {
+    return {name: obj.path, downloadUrl: obj.url};
+      } else {
+    return await getfileName(octokit, owner, repo, obj.sha);
+    }
+  });
+}
diff --git a/src/lib/index.ts b/src/lib/index.ts
index b729e59..8a4a623 100644
--- a/src/lib/index.ts
+++ b/src/lib/index.ts
@@ -7,6 +7,7 @@ import getChangedFiles from "../lib/github/changedFilesList";
 import getFilesContent, { FilesContent } from "./github/getFilesContent";
 import getNewIssuesFromSource from "./github/getNewIssue";
 import addIssuesToRepo from "./github/addIssuesToRepo";
+import getFiles from "../lib/github/getFilesOnInstall";
 import parseData from "./parser";
 
 import { mergeFileRepoIssues } from "./github/utils";
@@ -26,3 +27,16 @@ export async function addRepoCommentsToGH(context: Context): Promise<void> {
     return addIssuesToRepo(context, issuesToAddToRepo);
 }
 
+export async function addCommentsToGHonInstall(context: Context): Promise<void> {
+    // get changed files on install
+    const changedFiles = await getFiles(context);
+    // get file data
+    const filesContent: FilesContent[] = await getFilesContent(changedFiles); // error handling
+
+    const filesRepoIssues = filesContent.map(parseData);
+    // merge into a single set of FIXME and TODO issues
+    const repoIssues = mergeFileRepoIssues(filesRepoIssues);
+    const issuesToAddToRepo = await getNewIssuesFromSource(context, repoIssues);
+    return addIssuesToRepo(context, issuesToAddToRepo);
+}
+