diff --git a/m4/texinfo.m4 b/m4/texinfo.m4
index 251d039df2c..231d0b35736 100644
--- a/m4/texinfo.m4
+++ b/m4/texinfo.m4
@@ -12,7 +12,8 @@ AC_REQUIRE([gl_SET_DOCMISC_W32])
 AC_REQUIRE([gl_SET_DOCLANGS])
 ])
 dnl
-dnl gl_FIND_MAKEINFO
+dnl gl_SET_MAKEINFO
+dnl set the MAKEINFO precious variable to the suitable makeinfo compiler.
 AC_DEFUN([gl_SET_MAKEINFO],[dnl
 [## Require makeinfo >= 4.13 (last of the 4.x series) to build the manuals.
 : ${MAKEINFO:=makeinfo}