doclets/gtkdoclet: Use %NULL when manually commenting errors

diff --git a/src/doclets/gtkdoc/generator.vala b/src/doclets/gtkdoc/generator.vala
index ab0f985555b76a1ab9507d9885bbb8c7bc7669c1..98446bbce654325ff55dcbbce88b50bf15fb5b18 100644 (file)
--- a/src/doclets/gtkdoc/generator.vala
+++ b/src/doclets/gtkdoc/generator.vala
@@ -295,7 +295,7 @@ public class Gtkdoc.Generator : Api.Visitor {
                                        return;
                                }
                        }
-                       add_manual_header ("error", "location to store the error occuring, or NULL to ignore", {"out"});
+                       add_manual_header ("error", "location to store the error occuring, or %NULL to ignore", {"out"});
                } else {
                        // error domain definition
                        var old_headers = current_headers;