diff --git a/src/makefiles/Makefile.ultrix4 b/src/makefiles/Makefile.ultrix4
index 09e37b7d271e7896a68d070f6a9d56a2d66b1d0a..1c03737756fd6c887a1972bd320353e3c82100cd 100644
--- a/src/makefiles/Makefile.ultrix4
+++ b/src/makefiles/Makefile.ultrix4
@@ -1,3 +1,4 @@
+# used by initdb
 SHELL=/bin/sh5
 AROPT = crs