diff --git a/ac/fmt.m4 b/ac/fmt.m4
index 821631170..524274380 100644
--- a/ac/fmt.m4
+++ b/ac/fmt.m4
@@ -1,5 +1,5 @@
 dnl
-dnl Check for nlohmann's json-cpp library
+dnl Check for the fmt library
 dnl