diff --git a/docs/curl.1 b/docs/curl.1
index ebacfa243c0779..c4d1b426965124 100644
--- a/docs/curl.1
+++ b/docs/curl.1
@@ -1637,7 +1637,7 @@ without the domain, if there is a single domain and forest in your setup
 for example.
 
 To specify the domain name use either Down-Level Logon Name or UPN (User
-Principal Name) formats. For example, EXAMPLE\user and user@example.com
+Principal Name) formats. For example, EXAMPLE\\user and user@example.com
 respectively.
 
 If you use a Windows SSPI-enabled curl binary and perform Kerberos V5,
diff --git a/docs/libcurl/opts/CURLOPT_USERNAME.3 b/docs/libcurl/opts/CURLOPT_USERNAME.3
index 4cec5e93c5aefd..00fef19bbdc7da 100644
--- a/docs/libcurl/opts/CURLOPT_USERNAME.3
+++ b/docs/libcurl/opts/CURLOPT_USERNAME.3
@@ -47,7 +47,7 @@ without the domain name should the server be part of a single domain and
 forest.
 
 To include the domain name use either Down-Level Logon Name or UPN (User
-Principal Name) formats. For example, EXAMPLE\user and user@example.com
+Principal Name) formats. For example, EXAMPLE\\user and user@example.com
 respectively.
 
 Some HTTP servers (on Windows) support inclusion of the domain for Basic
diff --git a/docs/libcurl/opts/CURLOPT_USERPWD.3 b/docs/libcurl/opts/CURLOPT_USERPWD.3
index acea15c21a75ab..bfcff77d8d799e 100644
--- a/docs/libcurl/opts/CURLOPT_USERPWD.3
+++ b/docs/libcurl/opts/CURLOPT_USERPWD.3
@@ -41,7 +41,7 @@ without the domain name should the server be part of a single domain and
 forest.
 
 To specify the domain name use either Down-Level Logon Name or UPN (User
-Principal Name) formats. For example, EXAMPLE\user and user@example.com
+Principal Name) formats. For example, EXAMPLE\\user and user@example.com
 respectively.
 
 Some HTTP servers (on Windows) support inclusion of the domain for Basic