diff --git a/README.md b/README.md
index 5f0d491..63f70f7 100644
--- a/README.md
+++ b/README.md
@@ -234,6 +234,7 @@ Scanned plotter manuals and marketing ephemera, mostly from the [Internet Archiv
 - [Roland DPX-3700A DPX-2700A User's Manual (Roland Direct Download)](https://downloadcenter.rolanddg.com/contents/manuals/DPX-3700A+2700A_USE_E_R8.pdf)
 - [Rotring Tubular Plotter Points Practical Tips and Information](https://archive.org/details/rotingtubularplotterpointprakticaltipsandinformation)
 - [Siemens C1613 Plotter Manual (German)](https://archive.org/details/SiemensC1613Manual)
+- [Tectronix HC100 Instruction Manual (1987)](https://archive.org/details/manualsonline-id-212d14c3-7d2f-4e64-906f-1a22e86d1f35/)
 - [Panasonic RK-P400C 4-Color Graphic Penwriter Manual](https://archive.org/details/panasonic-rk-p-400-c-manual)
 
 ### Ephemera