diff --git a/configure.in b/configure.in
index 880195c9432..e940b9305f8 100644
--- a/configure.in
+++ b/configure.in
@@ -1,7 +1,7 @@
 dnl ***********************************************
 dnl * Please run autoreconf to test your changes! *
 dnl ***********************************************
-dnl NOTE: autoconf 2.64 doesn't seem to work (use 1.63).
+dnl NOTE: autoconf 2.64 doesn't seem to work (use 2.63).
 
 # Set VERSION so we only need to edit in one place (i.e., here)
 m4_define(PYTHON_VERSION, 2.6)