diff --git a/README.md b/README.md
index 466b07c..640f9f6 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,9 @@ echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" |
 sudo apt update && sudo apt install bazel
 ```
 
+#### IPFS
+[Installation Guide](https://docs.ipfs.io/install/)
+
 ### MacOS
 
 #### Docker
@@ -46,6 +49,9 @@ brew install llvm protobuf python3.9
 brew install bazel
 ```
 
+#### IPFS
+[Installation Guide](https://docs.ipfs.io/install/)
+
 ## Content
 
 - [`images`](images) - base docker images for [`nexus`](nexus)
diff --git a/nexus/cognitron/README.md b/nexus/cognitron/README.md
index 40a1de1..291cbc3 100644
--- a/nexus/cognitron/README.md
+++ b/nexus/cognitron/README.md
@@ -1,5 +1,9 @@
 # Nexus Cognitron
 
+## Prerequisite
+
+Follow the [root guide](../../README.md) to install Docker, IPFS and Bazel (optionally)
+
 ## Guide
 
 #### 1. Download data dumps
@@ -12,8 +16,8 @@ ipfs get $COLLECTION
 
 #### 2. Launch Nexus Cognitron
 
+Create [`docker-compose.yml`](docker-compose.yml) file to set up Nexus Cognitron and then launch it:
 ```shell script
-cd nexus/cognitron
 docker-compose up
 ```
 
@@ -27,6 +31,6 @@ By default this script is just printing documents.
 
 ```shell script
 bazel run -c opt installer -- iterate \
-  --store-filepath scitech.store.tar \
+  --data-filepath $COLLECTION_PATH/index/scitech \
   --schema-filepath schema/scitech.yaml
 ```
diff --git a/nexus/cognitron/docker-compose.yml b/nexus/cognitron/docker-compose.yml
index eee6ec2..0c77420 100644
--- a/nexus/cognitron/docker-compose.yml
+++ b/nexus/cognitron/docker-compose.yml
@@ -19,4 +19,4 @@ services:
       - "50000:80"
     volumes:
       - '${COLLECTION_PATH}:/summa'
-version: "3.9"
+version: "3"
diff --git a/nexus/cognitron/installer/BUILD.bazel b/nexus/cognitron/installer/BUILD.bazel
index ee8232a..1a78d5b 100644
--- a/nexus/cognitron/installer/BUILD.bazel
+++ b/nexus/cognitron/installer/BUILD.bazel
@@ -13,6 +13,7 @@ py_binary(
     deps = [
         requirement("aioipfs"),
         requirement("fire"),
+        requirement("pyyaml"),
         requirement("tantipy"),
         requirement("izihawa_utils"),
     ],
diff --git a/nexus/cognitron/web/README.md b/nexus/cognitron/web/README.md
index 335fb5a..0bfba0f 100644
--- a/nexus/cognitron/web/README.md
+++ b/nexus/cognitron/web/README.md
@@ -1 +1,6 @@
 # Nexus Web
+
+#### Development
+```shell script
+bazel run web_dev
+```
\ No newline at end of file