diff --git a/README.md b/README.md
index cdd7526..ce95d9d 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ If you want to add custom package repositories to your image, you can include th
 You can use this to add [COPR repositories](https://copr.fedorainfracloud.org/) to your image.
 COPR is like the Arch User Repository for Fedora, where you can find extra packages that wouldn't otherwise be available. The repositories are community-created, so use them at your own risk. [Read more](https://docs.pagure.org/copr.copr/user_documentation.html)
 
-Tip: You can use the magic string `%FEDORA_VERSION%` in your repo URLs, to automatically refer to the correct repo for your recipe's `fedora-version`.
+Tip: You can use the magic string `%FEDORA_VERSION%` in your repo URLs, to automatically refer to the correct repository for your current Fedora version.
 
 ### Building multiple images
 
diff --git a/build.sh b/build.sh
index 6a4885c..7771846 100644
--- a/build.sh
+++ b/build.sh
@@ -12,15 +12,21 @@ get_yaml_string() {
     yq -- "$1" "$RECIPE_FILE"
 }
 
+# Automatically determine which Fedora version we're building.
+FEDORA_VERSION="$(cat /usr/lib/os-release | grep '^VERSION_ID=' | head -1 | sed 's,^VERSION_ID=,,')"
+
 # Read configuration variables.
-fedora_version="$(get_yaml_string '.fedora-version')"
+base_image="$(get_yaml_string '.base-image')"
+
+# Welcome.
+echo "Building custom Fedora ${FEDORA_VERSION} from image: \"${base_image}\"."
 
 # Add custom repos.
 get_yaml_array repos '.rpm.repos[]'
 if [[ ${#repos[@]} -gt 0 ]]; then
     echo "-- Adding repos defined in recipe.yml --"
     for repo in "${repos[@]}"; do
-        repo="${repo//%FEDORA_VERSION%/${fedora_version}}"
+        repo="${repo//%FEDORA_VERSION%/${FEDORA_VERSION}}"
         wget "$repo" -P /etc/yum.repos.d/
     done
     echo "---"
diff --git a/recipe.yml b/recipe.yml
index 683225a..18ecbf1 100644
--- a/recipe.yml
+++ b/recipe.yml
@@ -29,8 +29,8 @@ scripts:
 rpm:
   # A list of urls of ".repo" files that should be added to your system.
   # This is the proper way to add custom COPR repos to your image.
-  # Tip: Use `%FEDORA_VERSION%` instead of static Fedora version numbers, so that
-  # your repos automatically use the Fedora version defined in `fedora-version`,
+  # Tip: Use `%FEDORA_VERSION%` instead of static Fedora version numbers,
+  # so that your repos automatically use your image's actual Fedora version,
   # which greatly simplifies future maintenance of your custom recipe.
   repos:
     # Example (which also demonstrates version number expansion):