diff --git a/how can we develop transformative tools for thought.md b/how can we develop transformative tools for thought.md
index d7590823e..276a910ab 100644
--- a/how can we develop transformative tools for thought.md	
+++ b/how can we develop transformative tools for thought.md	
@@ -7,4 +7,5 @@
     - [[douglas engelbart]] #1962
     - [[vannevar bush]]
     - [[seymour papert]]
-    - [[ivan suthreland]]
+    - [[ivan sutherland]]
+  - [[kenneth iverson]] introduced the term [[tools for thought]] in [[notation as a tool of thought]] regarding [[APL]]
diff --git a/notation as a tool of thought.md b/notation as a tool of thought.md
new file mode 100644
index 000000000..647f4e02a
--- /dev/null
+++ b/notation as a tool of thought.md	
@@ -0,0 +1,2 @@
+- a [[paper]].
+  - #go https://www.eecg.utoronto.ca/~jzhu/csc326/readings/iverson.pdf