diff --git a/README.cpl-gc b/README.cpl-gc
new file mode 100644
index 000000000..2ad0e7fe9
--- /dev/null
+++ b/README.cpl-gc
@@ -0,0 +1,10 @@
+Copyright 2021 Holger Vogt
+New BSD license.
+
+A local garbage collector, especially cpl transmission line
+
+All memory allocation and deallocation are accompanied by functions from cplhash.c.
+Each time any memory is allocated, an entry is made into a hash table, storing the address.
+Each time memory is freed, this entry is removed again. Reallocation uses both procedures.
+Function mem_init() initializes the setup.
+Function mem_delete() frees all memory with addresses still found in the hash table.