diff --git a/manifests/init.pp b/manifests/init.pp
index 329cf3fa..314341b9 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -14,7 +14,7 @@
 #
 # [*log_dir*]
 #   (Optional) Directory where logs should be stored
-#   If set to boolean 'false', it will not log to any directory
+#   If set to $::os_service_default, it will not log to any directory
 #   Defaults to undef.
 #
 # [*default_transport_url*]
diff --git a/manifests/logging.pp b/manifests/logging.pp
index 4bf57f67..c367e950 100644
--- a/manifests/logging.pp
+++ b/manifests/logging.pp
@@ -22,7 +22,7 @@
 #
 #  [*log_dir*]
 #    (optional) Directory where logs should be stored.
-#    If set to boolean false, it will not log to any directory.
+#    If set to $::os_service_default, it will not log to any directory.
 #    Defaults to '/var/log/heat'
 #
 # [*logging_context_format_string*]
diff --git a/releasenotes/notes/fix_log_dir_documentation-abcdb4f483057b78.yaml b/releasenotes/notes/fix_log_dir_documentation-abcdb4f483057b78.yaml
new file mode 100644
index 00000000..25e070f3
--- /dev/null
+++ b/releasenotes/notes/fix_log_dir_documentation-abcdb4f483057b78.yaml
@@ -0,0 +1,3 @@
+---
+fixes:
+  - Fixed documentation for log_dir parameter