diff --git a/book/.codespellrc b/book/.codespellrc
index 24cc09d..3fe0661 100644
--- a/book/.codespellrc
+++ b/book/.codespellrc
@@ -2,4 +2,4 @@
 # SPDX-License-Identifier: CC0-1.0
 
 [codespell]
-skip = ./build,./source/diag/*.svg
+skip = ./build,./input,./source/diag/*.svg
diff --git a/book/Makefile b/book/Makefile
index 8e84021..8f8e64e 100644
--- a/book/Makefile
+++ b/book/Makefile
@@ -30,6 +30,7 @@ html-linkcheck: clean html
 codespell:
 	@$(PRINTF) "The following change suggestions are only warnings! (Please don't fix them)\n"
 	@$(CODESPELL) source/diag || true
+	@$(CODESPELL) input/ || true
 	@$(PRINTF) "The following change suggestions are errors!\n"
 	@$(CODESPELL) .