diff --git a/src/includes/nghttp2/asio_http2_client.h b/src/includes/nghttp2/asio_http2_client.h
index 59ba9b26..72579141 100644
--- a/src/includes/nghttp2/asio_http2_client.h
+++ b/src/includes/nghttp2/asio_http2_client.h
@@ -51,8 +51,8 @@ public:
   // Returns content-length.  -1 if it is unknown.
   int64_t content_length() const;
 
-  // Returns the response header fields.  The pusedo header fields,
-  // which start with colon (:), are exluced from this list.
+  // Returns the response header fields.  The pseudo header fields,
+  // which start with colon (:), are excluded from this list.
   const header_map &header() const;
 
   // Application must not call this directly.
@@ -107,8 +107,8 @@ public:
   // Returns request URI, split into components.
   const uri_ref &uri() const;
 
-  // Returns request header fields.  The pusedo header fields, which
-  // start with colon (:), are exluced from this list.
+  // Returns request header fields.  The pseudo header fields, which
+  // start with colon (:), are excluded from this list.
   const header_map &header() const;
 
   // Application must not call this directly.
diff --git a/src/includes/nghttp2/asio_http2_server.h b/src/includes/nghttp2/asio_http2_server.h
index d4ec489a..651af690 100644
--- a/src/includes/nghttp2/asio_http2_server.h
+++ b/src/includes/nghttp2/asio_http2_server.h
@@ -42,8 +42,8 @@ public:
   request();
   ~request();
 
-  // Returns request header fields.  The pusedo header fields, which
-  // start with colon (:), are exluced from this list.
+  // Returns request header fields.  The pseudo header fields, which
+  // start with colon (:), are excluded from this list.
   const header_map &header() const;
 
   // Returns method (e.g., GET).