add bazel notes
diff --git a/distro/README.md b/distro/README.md
index 0b07d17..b3c323c 100644
--- a/distro/README.md
+++ b/distro/README.md
@@ -15,4 +15,140 @@
## Step 2: Update Bazel
+- edit `WORKSPACE`
+- there are probably 7 places to edit
+- merge the PR
+Sample diff
+
+```
+***************
+*** 161,167 ****
+ # bazelbuild/bazel-skylib
+ "bazel-skylib-1.0.3.tar.gz",
+ # bazelbuild/platforms
+! "46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+ # bazelbuild/rules_cc
+--- 161,167 ----
+ # bazelbuild/bazel-skylib
+ "bazel-skylib-1.0.3.tar.gz",
+ # bazelbuild/platforms
+! "platforms-0.0.2.tar.gz",
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+ # bazelbuild/rules_cc
+***************
+*** 203,209 ****
+ # bazelbuild/bazel-skylib
+ "bazel-skylib-1.0.3.tar.gz": "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+ # bazelbuild/platforms
+! "46993efdd33b73649796c5fc5c9efb193ae19d51.zip": "66184688debeeefcc2a16a2f80b03f514deac8346fe888fb7e691a52c023dd88",
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+ # bazelbuild/rules_cc
+--- 203,209 ----
+ # bazelbuild/bazel-skylib
+ "bazel-skylib-1.0.3.tar.gz": "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+ # bazelbuild/platforms
+! "platforms-0.0.2.tar.gz": "48a2d8d343863989c232843e01afc8a986eb8738766bfd8611420a7db8f6f0c3",
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+ # bazelbuild/rules_cc
+***************
+*** 268,276 ****
+ "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+ ],
+ # bazelbuild/platforms
+! "46993efdd33b73649796c5fc5c9efb193ae19d51.zip": [
+! "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+! "https://github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+ ],
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": [
+--- 268,276 ----
+ "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+ ],
+ # bazelbuild/platforms
+! "platforms-0.0.2.tar.gz": [
+! "https://mirror.bazel.build/github.com/bazelbuild/platforms/releases/download/0.0.2/platforms-0.0.2.tar.gz",
+! "https://github.com/bazelbuild/platforms/releases/download/0.0.2/platforms-0.0.2.tar.gz",
+ ],
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": [
+***************
+*** 563,569 ****
+ # bazelbuild/bazel-skylib
+ "bazel-skylib-1.0.3.tar.gz",
+ # bazelbuild/platforms
+! "46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+ # bazelbuild/rules_cc
+--- 563,569 ----
+ # bazelbuild/bazel-skylib
+ "bazel-skylib-1.0.3.tar.gz",
+ # bazelbuild/platforms
+! "platforms-0.0.2.tar.gz",
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+ # bazelbuild/rules_cc
+***************
+*** 598,604 ****
+ # bazelbuild/bazel-skylib
+ "bazel-skylib-1.0.3.tar.gz": "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+ # bazelbuild/platforms
+! "46993efdd33b73649796c5fc5c9efb193ae19d51.zip": "66184688debeeefcc2a16a2f80b03f514deac8346fe888fb7e691a52c023dd88",
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+ # bazelbuild/rules_cc
+--- 598,604 ----
+ # bazelbuild/bazel-skylib
+ "bazel-skylib-1.0.3.tar.gz": "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+ # bazelbuild/platforms
+! "platforms-0.0.2.tar.gz": "48a2d8d343863989c232843e01afc8a986eb8738766bfd8611420a7db8f6f0c3",
+ # bazelbuild/rules_java
+ "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+ # bazelbuild/rules_cc
+***************
+*** 637,643 ****
+ "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+ ],
+ # bazelbuild/platforms
+! "46993efdd33b73649796c5fc5c9efb193ae19d51.zip": [
+ "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+ "https://github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+ ],
+--- 637,643 ----
+ "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+ ],
+ # bazelbuild/platforms
+! "platforms-0.0.2.tar.gz": [
+ "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+ "https://github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+ ],
+***************
+*** 747,757 ****
+
+ http_archive(
+ name = "platforms",
+! sha256 = "66184688debeeefcc2a16a2f80b03f514deac8346fe888fb7e691a52c023dd88",
+! strip_prefix = "platforms-46993efdd33b73649796c5fc5c9efb193ae19d51",
+ urls = [
+! "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+! "https://github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+ ],
+ )
+
+--- 747,756 ----
+
+ http_archive(
+ name = "platforms",
+! sha256 = "48a2d8d343863989c232843e01afc8a986eb8738766bfd8611420a7db8f6f0c3",
+ urls = [
+! "https://mirror.bazel.build/github.com/bazelbuild/platforms/releases/download/0.0.2/platforms-0.0.2.tar.gz",
+! "https://github.com/bazelbuild/platforms/releases/download/0.0.2/platforms-0.0.2.tar.gz",
+ ],
+ )
+```
