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diff --git a/doc/basic/ccache_def.rst b/doc/basic/ccache_def.rst
index d147f0d7a..53542adde 100644
--- a/doc/basic/ccache_def.rst
+++ b/doc/basic/ccache_def.rst
@@ -51,6 +51,13 @@ library.
requirement is for parent directory to exist and the current
process must have permissions to create the directory if it does
not exist. See :ref:`col_ccache` for details. New in release 1.10.
+ The following residual forms are supported:
+
+ * DIR:dirname
+ * DIR::dirpath/filename - a single cache within the directory
+
+ Switching to a ccache of the latter type causes it to become the
+ primary for the directory.
#. **FILE** caches are the simplest and most portable. A simple flat
file format is used to store one credential after another. This is