Indicate that we're in maintenance mode

diff --git a/README.md b/README.md
index 7146fe798e99bfa832718a32003fe7f74d3bc838..367e4253a9a86de815a1f9332a639a1073dd75f3 100644 (file)
--- a/README.md
+++ b/README.md
@@ -1,3 +1,14 @@
+**WARNING: THIS PROJECT IS IN MAINTENANCE MODE, DUE TO INSUFFICIENT MAINTAINER RESOURCES**
+
+It works fine, but will generally no longer be improved.
+
+We are currently only accepting changes which:
+
+* keep this compiling with the latest versions of Rust or its dependencies.
+* have minimal review requirements, such as documentation changes (so not totally new APIs).
+
+------
+
 A Set of bits.
 
 Documentation is available at https://contain-rs.github.io/bit-set/bit_set.