diff --git a/Makefile b/Makefile
index 30e5d24..00ebe60 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@
 # the Doc Template for RISC-V Extensions.
 
 DOCS := \
-	spec-sample.adoc fusa-whitepaper.adoc
+	fusa-whitepaper.adoc
 
 DATE ?= $(shell date +%Y-%m-%d)
 VERSION ?= v0.0.0