thodg/libgit2

diff --git a/tests/merge/trees/analysis.c b/tests/merge/trees/analysis.c
index c57d8c2..c744f1a 100644
--- a/tests/merge/trees/analysis.c
+++ b/tests/merge/trees/analysis.c
@@ -1,3 +1,6 @@
+// NOTE: this is essentially duplicated from tests/merge/workdir/analysis.c
+// You probably want to make changes to both files.
+
 #include "clar_libgit2.h"
 #include "git2/repository.h"
 #include "git2/merge.h"
diff --git a/tests/merge/workdir/analysis.c b/tests/merge/workdir/analysis.c
index 27d7dba..6b97da7 100644
--- a/tests/merge/workdir/analysis.c
+++ b/tests/merge/workdir/analysis.c
@@ -1,3 +1,6 @@
+// NOTE: this is essentially duplicated with tests/merge/trees/analysis.c
+// You probably want to make changes to both files.
+
 #include "clar_libgit2.h"
 #include "git2/repository.h"
 #include "git2/merge.h"