diff --git a/r/compute_firewall.html.markdown b/r/compute_firewall.html.markdown
index 1a058475..a2d69e51 100644
--- a/r/compute_firewall.html.markdown
+++ b/r/compute_firewall.html.markdown
@@ -43,7 +43,9 @@ The following arguments are supported:
 * `source_ranges` - (Optional) A list of source CIDR ranges that this
    firewall applies to.
 
-* `source_tags` - (Optional) A list of tags that this firewall applies to.
+* `source_tags` - (Optional) A list of source tags that this firewall applies to.
+
+* `target_tags` - (Optional) A list of target tags that this firewall applies to.
 
 The `allow` block supports: