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-rw-r--r--objectivec/GPBUtilities_PackagePrivate.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/objectivec/GPBUtilities_PackagePrivate.h b/objectivec/GPBUtilities_PackagePrivate.h
index 16859d48..c8b21ed7 100644
--- a/objectivec/GPBUtilities_PackagePrivate.h
+++ b/objectivec/GPBUtilities_PackagePrivate.h
@@ -309,7 +309,8 @@ NSString *GPBDecodeTextFormatName(const uint8_t *decodeData, int32_t key,
// A series of selectors that are used solely to get @encoding values
// for them by the dynamic protobuf runtime code. See
-// GPBMessageEncodingForSelector for details.
+// GPBMessageEncodingForSelector for details. GPBRootObject conforms to
+// the protocol so that it is encoded in the Objective C runtime.
@protocol GPBMessageSignatureProtocol
@optional