diff --git a/src/duct/include/CrashReporterClient.h b/src/duct/include/CrashReporterClient.h
index 21ce08d40..b65a0afd2 100644
--- a/src/duct/include/CrashReporterClient.h
+++ b/src/duct/include/CrashReporterClient.h
@@ -1,14 +1,34 @@
 #ifndef CRASHREPORTERCLIENT_H_
 #define CRASHREPORTERCLIENT_H_
 
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+#define CRASHREPORTER_ANNOTATIONS_SECTION "__crash_info"
+#define CRASHREPORTER_ANNOTATIONS_VERSION 5
+#define CRASH_REPORTER_CLIENT_HIDDEN __attribute__((visibility("hidden")))
+
 inline void CRSetCrashLogMessage(const char* text) {}
 inline void CRSetCrashLogMessage2(const char* path) {}
 inline const char* CRGetCrashLogMessage(void) { return 0; }
 
+struct crashreporter_annotations_t {
+    uint64_t version;
+    uint64_t message;
+    uint64_t signature_string;
+    uint64_t backtrace;
+    uint64_t message2;
+    uint64_t thread;
+    uint64_t dialog_mode;
+    uint64_t abort_cause;
+};
+
+CRASH_REPORTER_CLIENT_HIDDEN
+extern struct crashreporter_annotations_t gCRAnnotations;
+
 #ifdef __cplusplus
 }
 #endif