1 files changed, 35 insertions, 0 deletions
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ca9674d103..96db464b52 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,5 +1,38 @@
 # Contributing to Erlang/OTP
 
+## License
+
+By making a contribution to this project, I certify that:
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the 
+    best of my knowledge, is covered under an appropriate open 
+    source license and I have the right under that license to   
+    submit that work with modifications, whether created in whole
+    or in part by me, under the same open source license (unless
+    I am permitted to submit under a different license), as 
+    Indicated in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including 
+    all personal information I submit with it, including my
+    sign-off) is maintained indefinitely and may be redistributed
+    consistent with this project or the open source license(s)
+    involved.
+
+Erlang/otp is licensed under the
+Apache License 2.0
+
+As stated in: LICENSE.txt 
+
+http://developercertificate.org/
+
 ## Reporting a bug
 
 Report bugs at https://bugs.erlang.org. See [Bug reports](https://github.com/erlang/otp/wiki/Bug-reports)
@@ -10,6 +43,7 @@ for more information.
 You can contribute to Erlang/OTP by opening a Pull Request.
 
 Make sure you create a new branch for your pull request with `git checkout -b new-branch-name`.
+Give the branch a short but descriptive name, like `stdlib/lists-length-fix`.
 Never do your work directly on `maint` or `master`.
 
 ## Fixing a bug
@@ -75,6 +109,7 @@ conflicts or include the latest changes.
 compiled and that it works.
 
 * Check for unnecessary whitespace before committing with `git diff --check`.
+However, do not fix preexisting whitespace errors in otherwise untouched source lines.
 
 Check your coding style: