diff --git a/bic b/bic
index 66a8d0f..cb60769 100755
--- a/bic
+++ b/bic
@@ -173,7 +173,8 @@ build_posts() {
       date="$(mk_date "${_post}")"
       slug="$(mk_slug "${filename_sans_id%.md}")"
       id="$(mk_id "${filename}" "${filename_sans_id}")"
-      export title body date slug id post tags
+      [[ -n "${tags[*]}" ]] && has_tags=true
+      export title body date slug id post tags has_tags
       mo \
         "${SRC_DIR}"/entry.html \
         > "${DEST_DIR}/${slug}.html"
diff --git a/docs/index.md b/docs/index.md
index 2bcf2b4..9124003 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -135,8 +135,10 @@ Some specific keys used within entries (posts or drafts) and pages:
 - `slug`, to be used in URL (does _not_ contain the `.html` file extension)
 - `title`, taken from first line of file `# ...`
 - `date`, literally the `mtime` of the file
-- `id`, the number prefix for an entry encoded with [Hashids]
+- `id`, the number prefix for an _entry_ encoded with [Hashids]
 - `body`, converted Markdown to HTML contents (sans title)
+- `tags`, list of all tags for the _entry_
+- `has_tags`, if the _entry_ has tags (useful for conditional templating)
 
 Drafts will have a `draft` key set. Likewise, posts will have a `post` key set.
 
diff --git a/tests/tags/entry.html b/tests/tags/entry.html
index bb3ef8a..b900905 100644
--- a/tests/tags/entry.html
+++ b/tests/tags/entry.html
@@ -9,3 +9,5 @@
 {{#ALL_TAGS}}
 - {{@key}} {{.}}
 {{/ALL_TAGS}}
+
+{{#has_tags}}has_tags defined{{/has_tags}}
diff --git a/tests/test.bats b/tests/test.bats
index da44731..537ca5b 100644
--- a/tests/test.bats
+++ b/tests/test.bats
@@ -158,6 +158,8 @@
   run cat tests/tags/build/sitemap.xml
   [[ "${output}" == *"tags"* ]]
   [[ "${output}" == *"tags/one"* ]]
+  run cat tests/tags/build/test.html
+  [[ "${output}" == *"has_tags defined"* ]]
   rm -rf tests/tags/build
   [[ ! -d tests/tags/build ]]
 }