diff --git a/SUMMARY.md b/SUMMARY.md
index 56e5103..a36b439 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -20,7 +20,6 @@
   * [Separate Concerns](protocol/separate-concerns.md)
   * [Request Methods](protocol/use-appropriate-methods.md)
   * [Status Codes](protocol/use-appropriate-status-codes.md)
-  * [Caching](protocol/caching.md)
 * [Message](message/README.md)
   * [Message Formats](message/message-formats.md)
   * [Error Reporting](message/error-reporting.md)  
@@ -28,6 +27,8 @@
   * [JSON](message/json.md)
 * [Evolution](evolution/README.md)
   * [Changes and Versioning](evolution/versioning.md)
+* [Execution](execution/README.md)
+  * [Caching](execution/caching.md)
 * [API Clients](clients/README.md)
   * [Loose Coupling](clients/loose-coupling.md)
 * [Miscellaneous](miscellaneous.md)
diff --git a/execution/README.md b/execution/README.md
new file mode 100644
index 0000000..12a02c9
--- /dev/null
+++ b/execution/README.md
@@ -0,0 +1,2 @@
+# Execution
+Execution qualities, such as security and usability, which are observable at run time.
diff --git a/protocol/caching.md b/execution/caching.md
similarity index 100%
rename from protocol/caching.md
rename to execution/caching.md