diff --git a/Documentation/dependencies.md b/Documentation/dependencies.md
index 6ae93bad8d..1aef0544d9 100644
--- a/Documentation/dependencies.md
+++ b/Documentation/dependencies.md
@@ -60,7 +60,7 @@ For the most part the codebase is self-contained (e.g. all dependencies are vend
 
 ## Run-time dependencies
 
-* Linux 3.8+ (ideally 4.3+ to have overlay-on-overlay working), with the following options configured:
+* Linux 3.18+ (ideally 4.3+ to have overlay-on-overlay working), with the following options configured:
   * CONFIG_CGROUPS
   * CONFIG_NAMESPACES
   * CONFIG_UTS_NS
diff --git a/README.md b/README.md
index c34467ee50..e395fb39c1 100644
--- a/README.md
+++ b/README.md
@@ -73,3 +73,5 @@ Some portions of the codebase are derived from other projects under different li
 ## Known issues
 
 Due to a bug in the Linux kernel, using rkt's overlay support on top of an overlay filesystem requires Linux 4.3+.
+
+In some configurations, Linux 3.18+ is required to successfully garbage collect rkt pods.