diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00813b2..4d38f52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- AWS enhancement: Documentation updates.
+
 ## 2.4.0
 
 ### Added
diff --git a/src/Input/StartBuildInput.php b/src/Input/StartBuildInput.php
index d1f9bf2..aebf018 100644
--- a/src/Input/StartBuildInput.php
+++ b/src/Input/StartBuildInput.php
@@ -61,6 +61,9 @@ final class StartBuildInput extends Input
      *   want to build. If a pull request ID is specified, it must use the format `pr/pull-request-ID` (for example
      *   `pr/25`). If a branch name is specified, the branch's HEAD commit ID is used. If not specified, the default
      *   branch's HEAD commit ID is used.
+     * - `GitLab`:
+     *
+     *   The commit ID, branch, or Git tag to use.
      * - `Bitbucket`:
      *
      *   The commit ID, branch name, or tag name that corresponds to the version of the source code you want to build. If a
@@ -120,7 +123,7 @@ final class StartBuildInput extends Input
 
     /**
      * An authorization type for this build that overrides the one defined in the build project. This override applies only
-     * if the build project's source is BitBucket or GitHub.
+     * if the build project's source is BitBucket, GitHub, GitLab, or GitLab Self Managed.
      *
      * @var SourceAuth|null
      */
diff --git a/src/ValueObject/Build.php b/src/ValueObject/Build.php
index 4f6b882..9c4cdaa 100644
--- a/src/ValueObject/Build.php
+++ b/src/ValueObject/Build.php
@@ -178,7 +178,8 @@ final class Build
     private $logs;
 
     /**
-     * How long, in minutes, for CodeBuild to wait before timing out this build if it does not get marked as completed.
+     * How long, in minutes, from 5 to 480 (8 hours), for CodeBuild to wait before timing out this build if it does not get
+     * marked as completed.
      *
      * @var int|null
      */
diff --git a/src/ValueObject/ProjectSourceVersion.php b/src/ValueObject/ProjectSourceVersion.php
index 62ffe83..2351941 100644
--- a/src/ValueObject/ProjectSourceVersion.php
+++ b/src/ValueObject/ProjectSourceVersion.php
@@ -21,10 +21,11 @@ final class ProjectSourceVersion
      * The source version for the corresponding source identifier. If specified, must be one of:
      *
      * - For CodeCommit: the commit ID, branch, or Git tag to use.
-     * - For GitHub or GitLab: the commit ID, pull request ID, branch name, or tag name that corresponds to the version of
-     *   the source code you want to build. If a pull request ID is specified, it must use the format `pr/pull-request-ID`
-     *   (for example, `pr/25`). If a branch name is specified, the branch's HEAD commit ID is used. If not specified, the
+     * - For GitHub: the commit ID, pull request ID, branch name, or tag name that corresponds to the version of the source
+     *   code you want to build. If a pull request ID is specified, it must use the format `pr/pull-request-ID` (for
+     *   example, `pr/25`). If a branch name is specified, the branch's HEAD commit ID is used. If not specified, the
      *   default branch's HEAD commit ID is used.
+     * - For GitLab: the commit ID, branch, or Git tag to use.
      * - For Bitbucket: the commit ID, branch name, or tag name that corresponds to the version of the source code you want
      *   to build. If a branch name is specified, the branch's HEAD commit ID is used. If not specified, the default
      *   branch's HEAD commit ID is used.