diff --git a/Octokit.Reactive/Clients/IObservableIssueReactionsClient.cs b/Octokit.Reactive/Clients/IObservableIssueReactionsClient.cs
index 2a12a9049a..3cfc109bb1 100644
--- a/Octokit.Reactive/Clients/IObservableIssueReactionsClient.cs
+++ b/Octokit.Reactive/Clients/IObservableIssueReactionsClient.cs
@@ -16,7 +16,7 @@ public interface IObservableIssueReactionsClient
         IObservable<Reaction> Create(string owner, string name, int number, NewReaction reaction);
 
         /// <summary>
-        /// List reactions for an specified Issue.
+        /// List reactions for a specified Issue.
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#list-reactions-for-an-issue</remarks>
         /// <param name="owner">The owner of the repository</param>
diff --git a/Octokit/Clients/ICommitCommentReactionsClient.cs b/Octokit/Clients/ICommitCommentReactionsClient.cs
index 269c9644e8..7e1c73bfd0 100644
--- a/Octokit/Clients/ICommitCommentReactionsClient.cs
+++ b/Octokit/Clients/ICommitCommentReactionsClient.cs
@@ -6,7 +6,7 @@ namespace Octokit
     public interface ICommitCommentReactionsClient
     {
         /// <summary>
-        /// Creates a reaction for an specified Commit Comment
+        /// Creates a reaction for a specified Commit Comment
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#create-reaction-for-a-commit-comment</remarks>
         /// <param name="owner">The owner of the repository</param>
diff --git a/Octokit/Clients/IIssueCommentReactionsClient.cs b/Octokit/Clients/IIssueCommentReactionsClient.cs
index e524f6b9e5..6576201dd1 100644
--- a/Octokit/Clients/IIssueCommentReactionsClient.cs
+++ b/Octokit/Clients/IIssueCommentReactionsClient.cs
@@ -6,7 +6,7 @@ namespace Octokit
     public interface IIssueCommentReactionsClient
     {
         /// <summary>
-        /// Creates a reaction for an specified Issue Comment
+        /// Creates a reaction for a specified Issue Comment
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#create-reaction-for-an-issue-comment</remarks>
         /// <param name="owner">The owner of the repository</param>
@@ -17,7 +17,7 @@ public interface IIssueCommentReactionsClient
         Task<Reaction> Create(string owner, string name, int number, NewReaction reaction);
 
         /// <summary>
-        /// Get all reactions for an specified Issue Comment
+        /// Get all reactions for a specified Issue Comment
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#list-reactions-for-an-issue-comment</remarks>
         /// <param name="owner">The owner of the repository</param>
diff --git a/Octokit/Clients/IIssueReactionsClient.cs b/Octokit/Clients/IIssueReactionsClient.cs
index f30c93c943..478e0b2b8a 100644
--- a/Octokit/Clients/IIssueReactionsClient.cs
+++ b/Octokit/Clients/IIssueReactionsClient.cs
@@ -6,7 +6,7 @@ namespace Octokit
     public interface IIssueReactionsClient
     {
         /// <summary>
-        /// Get all reactions for an specified Issue
+        /// Get all reactions for a specified Issue
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#list-reactions-for-an-issue</remarks>
         /// <param name="owner">The owner of the repository</param>
@@ -16,7 +16,7 @@ public interface IIssueReactionsClient
         Task<IReadOnlyList<Reaction>> GetAll(string owner, string name, int number);
 
         /// <summary>
-        /// Creates a reaction for an specified Issue
+        /// Creates a reaction for a specified Issue
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#create-reaction-for-an-issue</remarks>
         /// <param name="owner">The owner of the repository</param>
diff --git a/Octokit/Clients/IssueCommentReactionsClient.cs b/Octokit/Clients/IssueCommentReactionsClient.cs
index 950159baf8..352475d59c 100644
--- a/Octokit/Clients/IssueCommentReactionsClient.cs
+++ b/Octokit/Clients/IssueCommentReactionsClient.cs
@@ -12,7 +12,7 @@ public IssueCommentReactionsClient(IApiConnection apiConnection)
         }
 
         /// <summary>
-        /// Creates a reaction for an specified Issue Comment
+        /// Creates a reaction for a specified Issue Comment
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#create-reactions-for-an-issue-comment</remarks>
         /// <param name="owner">The owner of the repository</param>
@@ -30,7 +30,7 @@ public Task<Reaction> Create(string owner, string name, int number, NewReaction
         }
 
         /// <summary>
-        /// Get all reactions for an specified Issue Comment
+        /// Get all reactions for a specified Issue Comment
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#list-reactions-for-an-issue-comment</remarks>
         /// <param name="owner">The owner of the repository</param>
diff --git a/Octokit/Clients/IssueReactionsClient.cs b/Octokit/Clients/IssueReactionsClient.cs
index ecb96c0a27..d630bfcee9 100644
--- a/Octokit/Clients/IssueReactionsClient.cs
+++ b/Octokit/Clients/IssueReactionsClient.cs
@@ -12,7 +12,7 @@ public IssueReactionsClient(IApiConnection apiConnection)
         }
 
         /// <summary>
-        /// Creates a reaction for an specified Issue
+        /// Creates a reaction for a specified Issue
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#create-reactions-for-an-issue</remarks>
         /// <param name="owner">The owner of the repository</param>
@@ -30,7 +30,7 @@ public Task<Reaction> Create(string owner, string name, int number, NewReaction
         }
 
         /// <summary>
-        /// Get all reactions for an specified Issue
+        /// Get all reactions for a specified Issue
         /// </summary>
         /// <remarks>https://developer.github.com/v3/reactions/#list-reactions-for-an-issue</remarks>
         /// <param name="owner">The owner of the repository</param>
diff --git a/Octokit/Helpers/ApiUrls.cs b/Octokit/Helpers/ApiUrls.cs
index 7b0d2c2073..ca28659dff 100644
--- a/Octokit/Helpers/ApiUrls.cs
+++ b/Octokit/Helpers/ApiUrls.cs
@@ -319,7 +319,7 @@ public static Uri IssueLock(string owner, string name, int number)
         }
 
         /// <summary>
-        /// Returns the <see cref="Uri"/> for the reaction of an specified issue.
+        /// Returns the <see cref="Uri"/> for the reaction of a specified issue.
         /// </summary>
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
@@ -366,7 +366,7 @@ public static Uri IssueComment(string owner, string name, int id)
         }
 
         /// <summary>
-        /// Returns the <see cref="Uri"/> for the reaction of an specified issue comment.
+        /// Returns the <see cref="Uri"/> for the reaction of a specified issue comment.
         /// </summary>
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
@@ -1208,7 +1208,7 @@ public static Uri PullRequestReviewComment(string owner, string name, int number
         }
 
         /// <summary>
-        /// Returns the <see cref="Uri"/> for the reaction of an specified pull request review comment.
+        /// Returns the <see cref="Uri"/> for the reaction of a specified pull request review comment.
         /// </summary>
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>