diff --git a/Deep-Verification-Base.md b/Deep-Verification-Base.md
index d9a50f4..38a5587 100644
--- a/Deep-Verification-Base.md
+++ b/Deep-Verification-Base.md
@@ -83,7 +83,7 @@ This is a brief description of the idea.
 
 # Schematic extraction tool
 
-Having a hierarchical processing engine allows generating hierarchical device recognition markers. 
+Having a hierarchical processing engine allows generating hierarchical device recognition markers. This is a prerequisite for hierarchical schematic extraction.
 
 Device recognition consists of: