diff --git a/luamml-patches-amsmath.sty b/luamml-patches-amsmath.sty
index c100ee5..6baf949 100644
--- a/luamml-patches-amsmath.sty
+++ b/luamml-patches-amsmath.sty
@@ -401,17 +401,17 @@
       \UseTaggingSocket{math/luamml/mtable/innertable/finalize}
       \UseTaggingSocket{math/luamml/annotate/false} {}{ \, }
     }
+
+    % {cases} is defined by the kernel, but we patch the overwritten version by amsmath.
+    \PackageInfo{luamml}{patching~\string\env@cases}
+    \cs_set:Npn \env@cases {
+      \let \@ifnextchar \new@ifnextchar
+      \left \lbrace
+        \def \arraystretch {1.2}
+        \array {@{}l@{\quad \luamml_ignore:}l@{}}
+    }
   } %end package test
 
-% {cases} is defined by the kernel, but we patch the overwritten version by amsmath.
-\cs_set:Npn \env@cases {
-  \let \@ifnextchar \new@ifnextchar
-  \left \lbrace
-    \def \arraystretch {1.2}
-    \array {@{}l@{\quad \luamml_ignore:}l@{}}
-}
-
-
 \cs_set:Npn \bBigg@ #1 #2 {
   {
     \ensuremath {