diff --git a/src/scripting/decal.hpp b/src/scripting/decal.hpp
index 3e5cf0a1d0c..d14a1a4693d 100644
--- a/src/scripting/decal.hpp
+++ b/src/scripting/decal.hpp
@@ -66,8 +66,8 @@ class Decal final
    */
   void fade_out(float time);
   /**
-   * Sets the action for this decal
-   * @param float $time
+   * Sets the action for the decal's sprite.
+   * @param string $action
    */
   void set_action(const std::string& action);
 };