diff --git a/simple-git/src/lib/simple-git-api.ts b/simple-git/src/lib/simple-git-api.ts
index ee5182c2..6efc7900 100644
--- a/simple-git/src/lib/simple-git-api.ts
+++ b/simple-git/src/lib/simple-git-api.ts
@@ -39,9 +39,9 @@ export class SimpleGitApi implements SimpleGitBase {
       });
    }
 
-   add(files: string | string[]) {
+   add(files: string | string[], force: bool = false) {
       return this._runTask(
-         straightThroughStringTask(['add', ...asArray(files)]),
+         straightThroughStringTask(['add', force ? '-f': '', ...asArray(files)]),
          trailingFunctionArgument(arguments)
       );
    }
diff --git a/simple-git/typings/simple-git.d.ts b/simple-git/typings/simple-git.d.ts
index f4ecfdc2..7a392437 100644
--- a/simple-git/typings/simple-git.d.ts
+++ b/simple-git/typings/simple-git.d.ts
@@ -16,7 +16,7 @@ export interface SimpleGitBase {
    /**
     * Adds one or more files to source control
     */
-   add(files: string | string[], callback?: types.SimpleGitTaskCallback<string>): Response<string>;
+   add(files: string | string[], force: bool = false, callback?: types.SimpleGitTaskCallback<string>): Response<string>;
 
    /**
     * Sets the working directory of the subsequent commands.