diff --git a/lib/curl_sasl.c b/lib/curl_sasl.c
index 62d96133e718f33395bc775c8645741e8e5b1308..343a1bb5dad15c5b595d7f930d4636b7959a18e3 100644
--- a/lib/curl_sasl.c
+++ b/lib/curl_sasl.c
@@ -37,7 +37,7 @@
 /*
  * Curl_sasl_create_plain_message()
  *
- * This is used to generate an already encoded plain message ready
+ * This is used to generate an already encoded PLAIN message ready
  * for sending to the recipient.
  *
  * Parameters:
@@ -82,7 +82,7 @@ CURLcode Curl_sasl_create_plain_message(struct SessionHandle *data,
 /*
  * Curl_sasl_create_login_message()
  *
- * This is used to generate an already encoded login message containing the
+ * This is used to generate an already encoded LOGIN message containing the
  * user name or password ready for sending to the recipient.
  *
  * Parameters:
diff --git a/lib/curl_sasl.h b/lib/curl_sasl.h
index 43f853d776d01d3c9c1eccfe0a7df2485a7ae58a..f1b104f30c8c2f7aa66cea3c2f980a3dcf7550f6 100644
--- a/lib/curl_sasl.h
+++ b/lib/curl_sasl.h
@@ -33,13 +33,13 @@
 #define SASL_AUTH_EXTERNAL      0x0020
 #define SASL_AUTH_NTLM          0x0040
 
-/* This is used to generate a base64 encoded plain authentication message */
+/* This is used to generate a base64 encoded PLAIN authentication message */
 CURLcode Curl_sasl_create_plain_message(struct SessionHandle *data,
                                         const char* userp,
                                         const char* passwdp,
                                         char **outptr, size_t *outlen);
 
-/* This is used to generate a base64 encoded login authentication message
+/* This is used to generate a base64 encoded LOGIN authentication message
    containing either the user name or password details */
 CURLcode Curl_sasl_create_login_message(struct SessionHandle *data,
                                         const char* valuep, char **outptr,