Update comments

docker-compose.yml

@@ -103,7 +103,6 @@ services:
     build:
       context: ./docker/handshake
       dockerfile: Dockerfile
-    # Migration.  
     command: --chain-migrate=1 --wallet-migrate=1
     container_name: handshake
     restart: unless-stopped

docker/handshake/Dockerfile

@@ -3,7 +3,11 @@ FROM node:16.5.0-alpine
 WORKDIR /opt/hsd
 
 RUN apk update && apk add bash unbound-dev gmp-dev g++ gcc make python2 git
-# Checkout a specific commit until Handshake releases 2.4.0 then we should switch to that tag.
+# Checkout a specific commit until Handshake releases the next release after
+# 2.4.0 then we should switch to that tag.
+#
+# The commit we are targetting right now contains a fix for handling the chain
+# migration code for new portals.
 RUN git clone https://github.com/handshake-org/hsd.git /opt/hsd && \
     cd /opt/hsd && git checkout 6f0927db32723d6320c8bff255a6ccf70b2ccd32 && cd -
 RUN npm install --production