diff --git a/.github/workflows/check_changelog.yml b/.github/workflows/check_changelog.yml
index 0d1139f..282bf46 100644
--- a/.github/workflows/check_changelog.yml
+++ b/.github/workflows/check_changelog.yml
@@ -1,13 +1,17 @@
 name: Check Changelog
 
 on:
- pull_request:
-  types: [opened, reopened, edited, synchronize]
+  pull_request:
+    types: [opened, reopened, edited, synchronize]
+
 jobs:
- build:
-   runs-on: ubuntu-latest
-   steps:
-   - uses: actions/checkout@v1
-   - name: Check that CHANGELOG is touched
-     run: |
-       cat $GITHUB_EVENT_PATH | jq .pull_request.title |  grep -i '\[\(\(changelog skip\)\|\(ci skip\)\)\]' ||  git diff remotes/origin/${{ github.base_ref }} --name-only | grep CHANGELOG.md
+  check-changelog:
+    runs-on: ubuntu-latest
+    if: |
+      !contains(github.event.pull_request.body, '[skip changelog]') &&
+      !contains(github.event.pull_request.body, '[changelog skip]') &&
+      !contains(github.event.pull_request.body, '[skip ci]')
+    steps:
+      - uses: actions/checkout@v1
+      - name: Check that CHANGELOG is touched
+        run: git diff remotes/origin/${{ github.base_ref }} --name-only | grep CHANGELOG.md
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..b24fd59
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,37 @@
+# APT Buildpack Changelog
+
+## Unreleased
+
+
+## 2021-03-10
+
+- Output a helpful error message when no `Aptfile` is found ([#87](https://github.com/heroku/heroku-buildpack-apt/pull/87)).
+
+## 2021-01-15
+
+- Fail the build if `apt-get` or `curl` errors ([#79](https://github.com/heroku/heroku-buildpack-apt/pull/79)).
+- Only try to add custom repositories when some are defined in `Aptfile` ([#79](https://github.com/heroku/heroku-buildpack-apt/pull/79)).
+
+## 2019-10-17
+
+- Flush the cache on stack change ([#58](https://github.com/heroku/heroku-buildpack-apt/pull/58)).
+
+## 2019-09-06
+
+- Stop using `force-yes` with newer version of apt-get ([#51](https://github.com/heroku/heroku-buildpack-apt/pull/51)).
+
+## 2019-06-11
+
+- Prevent APT using source lists from `/etc/apt/sources.list.d/` ([#46](https://github.com/heroku/heroku-buildpack-apt/pull/46)).
+
+## 2019-06-10
+
+- Add support for comments in `Aptfile` ([#24](https://github.com/heroku/heroku-buildpack-apt/pull/24)).
+
+## 2017-09-13
+
+- Add support for custom repositories ([#18](https://github.com/heroku/heroku-buildpack-apt/pull/18)).
+
+## 2016 and earlier
+
+See the [Git log](https://github.com/heroku/heroku-buildpack-apt/commits/40883f0cb8e8ddb2876ca8be5d25ade4ff9617b1).
diff --git a/README.md b/README.md
index 515a9ec..b1e201b 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,13 @@ Added ability to also specify custom repositories through **:repo:** in `Aptfile
 
 This buildpack is not meant to be used on its own, and instead should be in used in combination with Heroku's [multiple buildpack support](https://devcenter.heroku.com/articles/using-multiple-buildpacks-for-an-app).
 
-Include a list of apt package names to be installed in a file named `Aptfile`
+Include a list of apt package names to be installed in a file named `Aptfile`.
+
+To find out what packages are available, see:
+<https://packages.ubuntu.com>
+
+See the [Heroku Stacks](https://devcenter.heroku.com/articles/stack) documention for which
+Ubuntu LTS version is used by each Heroku stack.
 
 ## Example
 
@@ -29,25 +35,13 @@ heroku buildpacks:add --index 1 https://github.com/heroku/heroku-buildpack-apt
 #### Aptfile
 
     # you can list packages
-    libpq-dev
+    libexample-dev
+    
     # or include links to specific .deb files
-    http://downloads.sourceforge.net/project/wkhtmltopdf/0.12.1/wkhtmltox-0.12.1_linux-precise-amd64.deb
-    # or add custom apt repos
-    :repo:deb http://cz.archive.ubuntu.com/ubuntu artful main universe
-
-#### Gemfile
-
-    source "https://rubygems.org"
-    gem "pg"
-
-### Check out the PG library version
-
-    $ heroku run bash -a apt-pg-test
-    ~ $ irb
-	irb(main):001:0> require "pg"
-	=> true
-	irb(main):002:0> PG::version_string
-	=> "PG 0.15.1"
+    https://downloads.example.com/example.deb
+    
+    # or add custom apt repos (only required if using packages outside of the standard Ubuntu APT repositories)
+    :repo:deb https://apt.example.com/ example-distro main
 
 ## License
 
diff --git a/bin/compile b/bin/compile
index 577380d..8fe78e5 100755
--- a/bin/compile
+++ b/bin/compile
@@ -2,7 +2,7 @@
 # bin/compile <build-dir> <cache-dir>
 
 # fail fast
-set -e
+set -eo pipefail
 
 # debug
 # set -x
@@ -67,8 +67,10 @@ else
   cat "/etc/apt/sources.list" > "$APT_SOURCES"    # no cp here
   # add custom repositories from Aptfile to sources.list
   # like>>    :repo:deb http://cz.archive.ubuntu.com/ubuntu artful main universe
-  topic "Adding custom repositories"
-  cat $BUILD_DIR/Aptfile | grep -s -e "^:repo:" | sed 's/^:repo:\(.*\)\s*$/\1/g' >> $APT_SOURCES
+  if grep -q -e "^:repo:" $BUILD_DIR/Aptfile; then
+    topic "Adding custom repositories"
+    cat $BUILD_DIR/Aptfile | grep -s -e "^:repo:" | sed 's/^:repo:\(.*\)\s*$/\1/g' >> $APT_SOURCES
+  fi
 fi
 
 APT_OPTIONS="-o debug::nolocking=true -o dir::cache=$APT_CACHE_DIR -o dir::state=$APT_STATE_DIR"
@@ -85,7 +87,7 @@ for PACKAGE in $(cat $BUILD_DIR/Aptfile | grep -v -s -e '^#' | grep -v -s -e "^:
     PACKAGE_FILE=$APT_CACHE_DIR/archives/$PACKAGE_NAME.deb
 
     topic "Fetching $PACKAGE"
-    curl -s -L -z $PACKAGE_FILE -o $PACKAGE_FILE $PACKAGE 2>&1 | indent
+    curl --silent --show-error --fail -L -z $PACKAGE_FILE -o $PACKAGE_FILE $PACKAGE 2>&1 | indent
   else
     topic "Fetching .debs for $PACKAGE"
     apt-get $APT_OPTIONS -y $APT_FORCE_YES -d install --reinstall $PACKAGE | indent
diff --git a/bin/detect b/bin/detect
index c5e4eb4..6d92e28 100755
--- a/bin/detect
+++ b/bin/detect
@@ -2,7 +2,9 @@
 # bin/detect <build-dir>
 
 if [ -f $1/Aptfile ]; then
-  echo "Apt" && exit 0
+  echo "Apt"
+  exit 0
 else
-  echo "no" && exit 1
+  echo "Could not find an 'Aptfile'! Please ensure it exists and is checked into Git." >&2
+  exit 1
 fi