diff --git a/logicalhacking.zsh b/logicalhacking.zsh
index 01170f9..7c41bbd 100644
--- a/logicalhacking.zsh
+++ b/logicalhacking.zsh
@@ -22,7 +22,8 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 #
-
+# SPDX-License-Identifier: MIT
+#
 basedir=`dirname $0:A`
 source $basedir/plugins/isabelle/isabelle.plugin.zsh
 fpath=($basedir/plugins/isabelle $fpath)
diff --git a/plugins/isabelle/isabelle.plugin.zsh b/plugins/isabelle/isabelle.plugin.zsh
index 2190a22..1d6721a 100755
--- a/plugins/isabelle/isabelle.plugin.zsh
+++ b/plugins/isabelle/isabelle.plugin.zsh
@@ -22,6 +22,8 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 #
+# SPDX-License-Identifier: MIT
+#
 
 zmodload zsh/pcre
 
diff --git a/themes/logicalhacking.zsh-theme b/themes/logicalhacking.zsh-theme
index ac8dd81..ec73012 100755
--- a/themes/logicalhacking.zsh-theme
+++ b/themes/logicalhacking.zsh-theme
@@ -23,6 +23,8 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 #
+# SPDX-License-Identifier: MIT
+#
 # # README
 #
 # In order for this theme to render correctly, you will need a