diff --git a/include/android/sharedmem.h b/include/android/sharedmem.h
index 8c3ff74..7f5177b 100644
--- a/include/android/sharedmem.h
+++ b/include/android/sharedmem.h
@@ -94,7 +94,8 @@
  *     int fd = ASharedMemory_create("memory", 128);
  *
  *     // By default it has PROT_READ | PROT_WRITE | PROT_EXEC.
- *     char *buffer = (char *) mmap(NULL, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ *     size_t memSize = ASharedMemory_getSize(fd);
+ *     char *buffer = (char *) mmap(NULL, memSize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  *
  *     strcpy(buffer, "This is an example."); // trivially initialize content
  *
diff --git a/vulkan/vkjson/Android.bp b/vulkan/vkjson/Android.bp
index e387165..93620f4 100644
--- a/vulkan/vkjson/Android.bp
+++ b/vulkan/vkjson/Android.bp
@@ -7,6 +7,7 @@
     cflags: [
         "-Wall",
         "-Werror",
+        "-Wimplicit-fallthrough",
     ],
     cppflags: [
         "-std=c++11",
@@ -33,6 +34,7 @@
     cflags: [
         "-Wall",
         "-Werror",
+        "-Wimplicit-fallthrough",
     ],
     cppflags: [
         "-std=c++11",
diff --git a/vulkan/vkjson/vkjson.cc b/vulkan/vkjson/vkjson.cc
index 6200383..efe622d 100644
--- a/vulkan/vkjson/vkjson.cc
+++ b/vulkan/vkjson/vkjson.cc
@@ -766,6 +766,7 @@
                          &device->external_fence_properties) &&
           visitor->Visit("externalSemaphoreProperties",
                          &device->external_semaphore_properties);
+      FALLTHROUGH_INTENDED;
     case VK_API_VERSION_1_0:
       ret &= visitor->Visit("properties", &device->properties) &&
              visitor->Visit("features", &device->features) &&
@@ -786,6 +787,7 @@
   switch (instance->api_version ^ VK_VERSION_PATCH(instance->api_version)) {
     case VK_API_VERSION_1_1:
       ret &= visitor->Visit("deviceGroups", &instance->device_groups);
+      FALLTHROUGH_INTENDED;
     case VK_API_VERSION_1_0:
       ret &= visitor->Visit("layers", &instance->layers) &&
              visitor->Visit("extensions", &instance->extensions) &&
diff --git a/vulkan/vkjson/vkjson.h b/vulkan/vkjson/vkjson.h
index 5e8428a..4f97c3e 100644
--- a/vulkan/vkjson/vkjson.h
+++ b/vulkan/vkjson/vkjson.h
@@ -41,6 +41,12 @@
 #define VK_API_VERSION_1_1 VK_MAKE_VERSION(1, 1, 0)
 #endif
 
+/*
+ * Annotation to tell clang that we intend to fall through from one case to
+ * another in a switch. Sourced from android-base/macros.h.
+ */
+#define FALLTHROUGH_INTENDED [[clang::fallthrough]]
+
 struct VkJsonLayer {
   VkLayerProperties properties;
   std::vector<VkExtensionProperties> extensions;