diff --git a/lib/index.js b/lib/index.js
index 4758fe0..722bc9d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -170,6 +170,8 @@ module.exports = {
     }
 
     function _squeezePotential(subtype) {
+      // TODO: improve this so that the squeezePotential is the size of the
+      // tangle suffix built as a slice from the fieldRoots
       const rootHash = FeedV1.getFeedRootHash(myWho, fromSubtype(subtype))
       const tangle = peer.db.getTangle(rootHash)
       const maxDepth = tangle.getMaxDepth()
diff --git a/protospec.md b/protospec.md
index 623e4ae..79a5b86 100644
--- a/protospec.md
+++ b/protospec.md
@@ -5,7 +5,7 @@
 ```mermaid
 graph RL
 
-R["(Feed root)"]:::feedroot
+R["(Feed root)"]
 A[updates age]
 B[updates name]
 C[updates age]
@@ -53,7 +53,7 @@ highlighted in blue.
 ```mermaid
 graph RL
 
-R["(Feed root)"]:::feedroot
+R["(Feed root)"]
 A[updates age]:::blue
 A-->R
 classDef default fill:#bbb,stroke:#fff0,color:#000
@@ -65,7 +65,7 @@ classDef blue fill:#6af,stroke:#fff0,color:#000
 ```mermaid
 graph RL
 
-R["(Feed root)"]:::feedroot
+R["(Feed root)"]
 A[updates age]:::blue
 B[updates name]:::blue
 B-->A-->R
@@ -79,7 +79,7 @@ classDef blue fill:#6af,stroke:#fff0,color:#000
 ```mermaid
 graph RL
 
-R["(Feed root)"]:::feedroot
+R["(Feed root)"]
 A[updates age]
 B[updates name]:::blue
 C[updates age]:::blue
@@ -98,7 +98,7 @@ classDef blue fill:#6af,stroke:#fff0,color:#000
 ```mermaid
 graph RL
 
-R["(Feed root)"]:::feedroot
+R["(Feed root)"]
 A[updates age]
 B[updates name]:::blue
 C[updates age]:::blue
@@ -118,7 +118,7 @@ classDef blue fill:#6af,stroke:#fff0,color:#000
 ```mermaid
 graph RL
 
-R["(Feed root)"]:::feedroot
+R["(Feed root)"]
 A[updates age]
 B[updates name]
 C[updates age]