diff --git a/README.md b/README.md
index 051c451..50f386e 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 A GitHub Action for running cargo-semver-checks
 
 By default, this action assumes that:
-- Your cargo workspace contains a single crate.
+- Your cargo workspace contains a single crate which contains a library target.
 - Your releases are tagged in git as `v{major}.{minor}.{patch}`, for example `v1.2.3`.
 
 Single-crate workspaces can use it as:
@@ -13,9 +13,9 @@ Single-crate workspaces can use it as:
   run: # your `cargo publish` code here
 ```
 
-To use it in a workspace with more than one crate:
+In a workspace with more than one crate:
 - use the `crate-name` setting to specify which crate should be checked in a given run, and
-- use the `version-tag-prefix` setting to override the default prefix `v` to match the way the releases of your crate are tagged.
+- use the `version-tag-prefix` setting to override the default prefix `v` to match the way the releases of your crate are tagged. The version number `1.2.3` will be appended to this prefix.
 
 For example, this is publishing `my-crate` whose releases are tagged as `my-crate-v1.2.3`:
 ```
@@ -27,3 +27,13 @@ For example, this is publishing `my-crate` whose releases are tagged as `my-crat
 - name: Publish my-crate to crates.io
   run: # your `cargo publish` code here
 ```
+
+To check a different (non-library) target in a crate, use the `crate-target` setting:
+```
+- name: Check semver for my_binary
+  uses: obi1kenobi/cargo-semver-checks-action@v1
+  with:
+    crate-target: --bin my_binary
+- name: Publish my-crate to crates.io
+  run: # your `cargo publish` code here
+```
diff --git a/action.yml b/action.yml
index 0d31e2f..dac1ed2 100644
--- a/action.yml
+++ b/action.yml
@@ -5,6 +5,10 @@ inputs:
     description: 'The crate whose API to check for semver'
     required: false
     default: ''
+  crate-target:
+    description: 'By default, check the library target of the crate. If you'd like to check a different target (e.g. a binary target), set this to `--bin <NAME>`'
+    required: false
+    default: '--lib'
   version-tag-prefix:
     description: 'The prefix to use for the git tag for a version; the default "v" creates tags like "v1.0.0"'
     required: false
@@ -28,9 +32,23 @@ runs:
         # Record the current git sha, so we can come back to it after generating the baseline.
         export CURRENT_GIT_SHA="$(git rev-parse HEAD)"
 
+        # We add `--all-features` to semver-check every part of the crate.
+        # In principle, semver can be broken by moving public API code into a feature.
+        # Checking this requires rebuilding rustdoc multiple times with different sets of features,
+        # which can get expensive and is therefore left to individual maintainers' discretion.
+        #
+        # We add `--document-private-items` because for some reason, rustdoc seems to not always
+        # generate all implemented trait information without it:
+        # https://github.com/obi1kenobi/cargo-semver-check/issues/32
+        export RUSTDOC_EARLY_FLAGS="${{ inputs.crate-target }} --all-features"
+        export RUSTDOC_LATE_FLAGS="--document-private-items -Zunstable-options --output-format json"
+
         export PACKAGE_NAME="${{ inputs.crate-name }}"
         if [[ "$PACKAGE_NAME" == '' ]]; then
           export PACKAGE_NAME="$("$GITHUB_ACTION_PATH/find_workspace_crates.sh")"
+        else
+          # cargo rustdoc uses the exact package name, not the "underscores" version.
+          export RUSTDOC_EARLY_FLAGS="--package $PACKAGE_NAME $RUSTDOC_EARLY_FLAGS"
         fi
         export PACKAGE_NAME_WITH_UNDERSCORES="$(echo "$PACKAGE_NAME" | tr '-' '_')"
 
@@ -43,7 +61,7 @@ runs:
         export COMPARISON_TAG="${{ inputs.version-tag-prefix }}$("$GITHUB_ACTION_PATH/find_comparison_version.sh" "$PACKAGE_NAME")"
         git fetch --depth=1 origin "+refs/tags/$COMPARISON_TAG:refs/tags/$COMPARISON_TAG"
         git checkout "$COMPARISON_TAG"
-        cargo +nightly rustdoc -- -Zunstable-options --output-format json
+        cargo +nightly rustdoc $RUSTDOC_EARLY_FLAGS -- $RUSTDOC_LATE_FLAGS
         mv "$(cargo metadata --format-version 1 | jq -r .target_directory)/doc/$PACKAGE_NAME_WITH_UNDERSCORES.json" /tmp/baseline.json
 
         # Return to the original git sha.
@@ -51,7 +69,7 @@ runs:
 
         # Build rustdoc JSON for the current version, and move it to /tmp/
         # so it doesn't get overwritten by the baseline build.
-        cargo +nightly rustdoc -- -Zunstable-options --output-format json
+        cargo +nightly rustdoc $RUSTDOC_EARLY_FLAGS -- $RUSTDOC_LATE_FLAGS
         mv "$(cargo metadata --format-version 1 | jq -r .target_directory)/doc/$PACKAGE_NAME_WITH_UNDERSCORES.json" /tmp/current.json
 
         # Check for semver violations.