diff --git a/doc/tclcurl.html b/doc/tclcurl.html
index 5758241..9fe96c8 100755
--- a/doc/tclcurl.html
+++ b/doc/tclcurl.html
@@ -1244,6 +1244,18 @@ Enforce HTTP 1.0 requests.
 
 <DD>
 Enforce HTTP 1.1 requests.
+<DT><B>2.0</B>
+
+<DD>
+Enforce HTTP version 2 requests.
+<DT><B>2TLS</B>
+
+<DD>
+Enforce version 2 requests for HTTPS, version 1.1 for HTTP.
+<DT><B>2_PRIOR_KNOWLEDGE</B>
+
+<DD>
+Enforce HTTP 2 requests without performing HTTP/1.1 Upgrade first.
 </DL>
 </DL>
 
diff --git a/doc/tclcurl.n b/doc/tclcurl.n
index 6e7227a..59fce53 100755
--- a/doc/tclcurl.n
+++ b/doc/tclcurl.n
@@ -1047,6 +1047,15 @@ Enforce HTTP 1.0 requests.
 .TP
 .B 1.1
 Enforce HTTP 1.1 requests.
+.TP
+.B 2.0
+Enforce HTTP version 2 requests.
+.TP
+.B 2TLS
+Enforce version 2 requests for HTTPS, version 1.1 for HTTP.
+.TP
+.B 2_PRIOR_KNOWLEDGE
+Enforce HTTP 2 requests without performing HTTP/1.1 Upgrade first.
 .RE
 
 .TP
diff --git a/generic/tclcurl.h b/generic/tclcurl.h
index acbee1f..b235d58 100755
--- a/generic/tclcurl.h
+++ b/generic/tclcurl.h
@@ -294,7 +294,13 @@ CONST static char   *curlFormTable[]={
 };
 
 CONST static char   *httpVersionTable[] = {
-    "none", "1.0", "1.1", (char *)NULL
+    "none",  /* CURL_HTTP_VERSION_NONE */
+    "1.0",  /* CURL_HTTP_VERSION_1_0 */
+    "1.1",  /* CURL_HTTP_VERSION_1_1 */
+    "2.0",  /* CURL_HTTP_VERSION_2_0 */
+    "2TLS",  /* CURL_HTTP_VERSION_2TLS */
+    "2_PRIOR_KNOWLEDGE",  /* CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE */
+    (char *)NULL
 };
 
 CONST static char *netrcTable[] = {