diff --git a/GNUmakefile b/GNUmakefile
index f6013add..76ebb770 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -78,7 +78,7 @@ rpm:
 
 c_src = git ls-files '*.[ch]' ':!:subprojects'
 all_files = git ls-files ':!:subprojects'
-licensed_files = git ls-files ':!:*.svg' ':!:LICENSE' ':!:*.md' ':!:subprojects' ':!:debian'
+licensed_files = git ls-files ':!:*.svg' ':!:LICENSE' ':!:*.md' ':!:*.asc' ':!:subprojects' ':!:debian'
 
 .PHONY: lint
 lint:
diff --git a/devtools/gpg-signing-key.asc b/devtools/gpg-signing-key.asc
new file mode 100644
index 00000000..8eaeefaf
--- /dev/null
+++ b/devtools/gpg-signing-key.asc
@@ -0,0 +1,45 @@
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