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diff --git a/gis/saga-gis/README b/gis/saga-gis/README
index 3ea2a11b90..cf9842f984 100644
--- a/gis/saga-gis/README
+++ b/gis/saga-gis/README
@@ -8,3 +8,6 @@ environments (shell scripts, Python, R and so on).
SAGA can use these optional dependencies: libharu, opencv, postgresql and
qhull. SAGA currently does not build when vigra is installed.
+
+If SAGA fails to run after an upgrade, uninstall old versions of SAGA before
+compilation.