diff --git a/crypto_kem/kyber768/clean/GNUmakefile b/crypto_kem/kyber768/clean/Makefile
similarity index 59%
rename from crypto_kem/kyber768/clean/GNUmakefile
rename to crypto_kem/kyber768/clean/Makefile
index 27703b5a..616dcbf3 100644
--- a/crypto_kem/kyber768/clean/GNUmakefile
+++ b/crypto_kem/kyber768/clean/Makefile
@@ -1,7 +1,7 @@
-LIB=libkyber768_clean.a
+# This Makefile has been tested with GNU Make and BSD Make
 
-SOURCES=$(wildcard *.c)
-OBJECTS=$(patsubst %.c,%.o,$(SOURCES))
+LIB=libkyber768_clean.a
+OBJECTS=cbd.o indcpa.o kem.o kex.o ntt.o poly.o polyvec.o precomp.o reduce.o verify.o
 
 CFLAGS=-Wall -Wextra -Wpedantic -Werror -std=c99 -I../../../common $(EXTRAFLAGS)
 
diff --git a/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake b/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
index 13f3d73a..af4b6833 100644
--- a/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
+++ b/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
@@ -1,5 +1,7 @@
-LIB=libkyber768_clean.lib
+# This Makefile can be used with Microsoft Visual Studio's nmake using the command:
+#    nmake /f Makefile.Microsoft_nmake
 
+LIB=libkyber768_clean.lib
 OBJECTS=cbd.obj indcpa.obj kem.obj kex.obj ntt.obj poly.obj polyvec.obj precomp.obj reduce.obj verify.obj
 
 CFLAGS=/I ..\..\..\common /W1 /WX # FIXME: ideally would use /W4 instead of /W1, but too many failures in Kyber right now