diff --git a/src/interfaces/libpq/fe-auth-oauth.c b/src/interfaces/libpq/fe-auth-oauth.c
index f943a31cc08..97259fb5654 100644
--- a/src/interfaces/libpq/fe-auth-oauth.c
+++ b/src/interfaces/libpq/fe-auth-oauth.c
@@ -518,6 +518,7 @@ oauth_exchange(void *opaq, bool final,
        switch (state->state)
        {
                case FE_OAUTH_INIT:
+                       /* Initial Client Response */
                        Assert(inputlen == -1);
 
                        if (!derive_discovery_uri(conn))