diff --git a/config.md b/config.md
index 24922b7f2..d69215671 100644
--- a/config.md
+++ b/config.md
@@ -75,6 +75,7 @@ For all platform-specific configuration values, the scope defined below in the [
     * Windows: this field MUST NOT be supplied.
     * Solaris: corresponds to "type" of the fs resource in [zonecfg(1M)][zonecfg.1m].
 * **`source`** (string, OPTIONAL) A device name, but can also be a directory name or a dummy.
+    Path values are either absolute or relative to the bundle.
     * Windows: a local directory on the filesystem of the container host. UNC paths and mapped drives are not supported.
     * Solaris: corresponds to "special" of the fs resource in [zonecfg(1M)][zonecfg.1m].
 * **`options`** (array of strings, OPTIONAL) Mount options of the filesystem to be used.