Index: README.md
==================================================================
--- README.md
+++ README.md
@@ -61,8 +61,9 @@
 
 - [**Sourceforge Project Page**](https://sourceforge.net/projects/reduce-algebra/)
   - [**Sourceforge SVN Repository**](https://svn.code.sf.net/p/reduce-algebra/code/historical/)
 - [GitHub Mirror](https://github.com/reduce-algebra/reduce-historical/)
 - [SourceHut Mirror](https://git.sr.ht/~trn/reduce-historical/)
+- [NotABug Mirror](https://notabug.org/reduce-algebra/reduce-historical/)
 - [Chisel Mirror](https://chiselapp.com/user/reduce-algebra/repository/reduce-historical/)
 
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