diff --git a/doc/xschem_man/tutorial_ngspice_backannotation.html b/doc/xschem_man/tutorial_ngspice_backannotation.html
index ce629cd2..729204a7 100644
--- a/doc/xschem_man/tutorial_ngspice_backannotation.html
+++ b/doc/xschem_man/tutorial_ngspice_backannotation.html
@@ -144,7 +144,7 @@ write cmos_example.raw
   calculated as <kbd>V(GN) * Id(m3)</kbd>.
  </p>
  <img src="backannotation12.png">
- <p> you can wrap the whole expression inside a <kbd>[to_eng ... ]</kbd> to have the value displayed inengineering form
+ <p> you can wrap the whole expression inside a <kbd>[to_eng ... ]</kbd> to have the value displayed in engineering form
   using the usual SPICE suffixes (example: 131u for 131e-6)
  </p>
  <img src="backannotation15.png">