diff --git a/hplip.spec b/hplip.spec
index 2678d7d..bc43bd9 100644
--- a/hplip.spec
+++ b/hplip.spec
@@ -146,6 +146,9 @@ rm -rf $RPM_BUILD_DIR/%{name}-%{version}
 
 # Give up trying to print a job to a reconnected device (bug #515481).
 %patch11 -p1 -b .device-reconnected
+
+# Set a printer-state-reason when there's a missing required plugin
+# (bug #531330).
 %patch12 -p1 -b .plugin-error
 
 %build