diff --git a/docs/preso/01-D4/ihap.pdf b/docs/preso/01-D4/ihap.pdf
index bd6a9d4..0375bef 100644
Binary files a/docs/preso/01-D4/ihap.pdf and b/docs/preso/01-D4/ihap.pdf differ
diff --git a/docs/preso/01-D4/ihap.tex b/docs/preso/01-D4/ihap.tex
index 03bd3ad..ae9c38c 100644
--- a/docs/preso/01-D4/ihap.tex
+++ b/docs/preso/01-D4/ihap.tex
@@ -115,7 +115,7 @@ see \url{https://github.com/D4-Project}
                   \item [\checkmark] Passive SSL 
                   \item BGP mapping 
                   \item egress filtering mapping
-                  \item Radio-Specturm monitoring: 802.11, BLE, etc. 
+                  \item Radio-Spectrum monitoring: 802.11, BLE, etc. 
                   \item ...
                   \end{itemize}
 \end{frame}