diff --git a/generated/google-apis-gmail_v1/CHANGELOG.md b/generated/google-apis-gmail_v1/CHANGELOG.md
index aa3d05a54..45c0d6cc7 100644
--- a/generated/google-apis-gmail_v1/CHANGELOG.md
+++ b/generated/google-apis-gmail_v1/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Release history for google-apis-gmail_v1
 
+### v0.2.0 (2021-01-13)
+
+* Regenerated from discovery document revision 20210111
+
 ### v0.1.0 (2021-01-07)
 
 * Regenerated using generator version 0.1.1
diff --git a/generated/google-apis-gmail_v1/lib/google/apis/gmail_v1/gem_version.rb b/generated/google-apis-gmail_v1/lib/google/apis/gmail_v1/gem_version.rb
index 40289cf5f..b45f436c3 100644
--- a/generated/google-apis-gmail_v1/lib/google/apis/gmail_v1/gem_version.rb
+++ b/generated/google-apis-gmail_v1/lib/google/apis/gmail_v1/gem_version.rb
@@ -16,13 +16,13 @@ module Google
   module Apis
     module GmailV1
       # Version of the google-apis-gmail_v1 gem
-      GEM_VERSION = "0.1.0"
+      GEM_VERSION = "0.2.0"
 
       # Version of the code generator used to generate this client
       GENERATOR_VERSION = "0.1.1"
 
       # Revision of the discovery document this client was generated from
-      REVISION = "20200919"
+      REVISION = "20210111"
     end
   end
 end
diff --git a/generated/google-apis-gmail_v1/lib/google/apis/gmail_v1/service.rb b/generated/google-apis-gmail_v1/lib/google/apis/gmail_v1/service.rb
index 3339b8c00..f29abc9e3 100644
--- a/generated/google-apis-gmail_v1/lib/google/apis/gmail_v1/service.rb
+++ b/generated/google-apis-gmail_v1/lib/google/apis/gmail_v1/service.rb
@@ -760,7 +760,9 @@ module Google
         #   The user's email address. The special value `me` can be used to indicate the
         #   authenticated user.
         # @param [String] id
-        #   The ID of the message to retrieve.
+        #   The ID of the message to retrieve. This ID is usually retrieved using `
+        #   messages.list`. The ID is also contained in the result when a message is
+        #   inserted (`messages.insert`) or imported (`messages.import`).
         # @param [String] format
         #   The format to return the message in.
         # @param [Array<String>, String] metadata_headers
diff --git a/generated/google-apis-gmail_v1/synth.metadata b/generated/google-apis-gmail_v1/synth.metadata
index 429012f74..1ab2bfef3 100644
--- a/generated/google-apis-gmail_v1/synth.metadata
+++ b/generated/google-apis-gmail_v1/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-ruby-client.git",
-        "sha": "c98c719bbab68d0890524d53f8b629d7858af9c2"
+        "sha": "3d992047bedb44270f52d3e3de7e5883d565aff0"
       }
     }
   ]