diff --git a/.github/.cspell/project-dictionary.txt b/.github/.cspell/project-dictionary.txt
index 03df746b..1e15d297 100644
--- a/.github/.cspell/project-dictionary.txt
+++ b/.github/.cspell/project-dictionary.txt
@@ -12,7 +12,6 @@ rosmsg
 rustc
 rustdocflags
 rustflags
-rustfmt
 rustros
 rustup
 slerp
diff --git a/tools/spell-check.sh b/tools/spell-check.sh
index 4dcb774f..89ef6ad1 100755
--- a/tools/spell-check.sh
+++ b/tools/spell-check.sh
@@ -45,7 +45,7 @@ if [[ -n "$(git ls-files '*Cargo.toml')" ]]; then
     dependencies=$(sed <<<"${dependencies}" 's/[0-9_-]/\n/g' | LC_ALL=C sort -f -u)
 fi
 config_old=$(<.cspell.json)
-config_new=$(grep <<<"${config_old}" -v ' *//' | jq 'del(.dictionaries[])' | jq 'del(.dictionaryDefinitions[])')
+config_new=$(grep <<<"${config_old}" -v '^ *//' | jq 'del(.dictionaries[])' | jq 'del(.dictionaryDefinitions[])')
 trap -- 'echo "${config_old}" >.cspell.json; echo >&2 "$0: trapped SIGINT"; exit 1' SIGINT
 echo "${config_new}" >.cspell.json
 if [[ -n "${has_rust}" ]]; then